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general description the MAX5394 single, 256-tap volatile, low-voltage linear taper digital potentiometer offers three end-to- end resistance values of 10k? , 50k? , and 100k? . potentiometer terminals are independent of supply for voltages up to 5.25v with single-supply operation from 1.7v to 5.5v (charge pump enabled). user-controlled shutdown modes allow the h, w, or l terminal to be opened with the wiper position set to zero-code, mid- code, full-code, or the value contained in the wiper register. ultra-low-quiescent supply current (< 1a) can be achieved for supply voltages between 2.6v and 5.5v by disabling the internal charge pump and not allowing potentiometer terminals to exceed the supply voltage by more than 0.3v. the MAX5394 provides a low 50ppm/c end-to-end temperature coefficient and features a spi serial interface. the small package size, low operating supply voltage, low supply current, and automotive temperature range of the MAX5394 make the device uniquely suited for the portable consumer market, battery-backup industrial applications, and automotive market. the MAX5394 is available in a lead-free, 8-pin tdfn (2mm x 2mm) package. the device operates over the -40c to +125c automotive temperature range. features s single linear taper 256-tap positions s 10ki, 50ki, and 100ki end-to-end resistance s 1.7v to 5.5v extended single supply s 0 to 5.25v h, w, l operating voltage independent of v dd s 1a (typ) supply current in low-power mode s 1.0 lsb inl, 0.5 lsb dnl (max) wiper accuracy s power-on sets wiper to midscale s 50ppm/nc end-to-end temperature coefficient s 5ppm/nc ratiometric temperature coefficient s -40nc to +125nc operating temperature range s 2mm x 2mm, 8-pin tdfn package s spi-compatible serial interface applications portable electronics system calibration battery-powered systems automotive electronics mechanical potentiometer replacement typical operating circuit 19-6392; rev 1; 9/12 ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX5394.related spi interface 1.7v to 5.5v (charge pump enabled) h w l r1 v s v o +5v v dd MAX5394 max4250 gnd v o /v s = 1 + r MAX5394 /r 1 din sclk cs MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maximintegrated.com.
MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer 2 (all voltages referenced to gnd.) v dd ......................................................................... -0.3v to +6v h, w, l (charge pump enabled) ......................... -0.3v to +5.5v h, w, l (charge pump disabled) ................ -0.3v to the lower of (v dd + 0.3v) or +6v all other pins ......................................................... -0.3v to +6v continuous current into h, w, and l MAX5394l ......................................................................... 5ma MAX5394m ........................................................................ 2ma MAX5394n ........................................................................ 1ma maximum current into any input ....................................... 50ma continuous power dissipation (t a = +70nc) tdfn (derate 11.9mw/nc above +70nc) ................. 953.5mw operating temperature range ....................... -40nc to +125nc storage temperature range ........................... -65nc to + 150nc junction temperature ..................................................... +150nc lead temperature (soldering, 10s) .............................. + 300nc soldering temperature (reflow) ..................................... +260nc tdfn junction-to-ambient thermal resistance (q ja ) ....... 83.9c/w junction-to-case thermal resistance (q jc ) ............ 37.0c/w absolute maximum ratings note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera- tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. package thermal characteristics (note 1) electrical characteristics (v dd = 1.7v to 5.5v, v h = v dd , v l = gnd, t a = -40c to +125c, unless otherwise noted. typical values are at v dd = 1.8v, t a = +25c.) (note 2) parameter symbol conditions min typ max units resolution 256-tap family n 256 tap dc performance (voltage-divider mode) integral nonlinearity (note 3) inl -1.0 +1.0 lsb differential nonlinearity dnl (note 3) -0.5 +0.5 lsb ratiometric resistor tempco (dv w /v w )/dt, v h = v dd , v l = gnd, no load 5 ppm/c full-scale error (code ffh) charge pump enabled, 1.7v < v dd < 5.5v -0.5 lsb charge pump disabled, 2.6v < v dd < 5.5vs MAX5394m MAX5394n -0.5 MAX5394l -1.0 zero-scale error (code 00h) charge pump enabled, 1.7v < v dd < 5.5v +0.5 lsb charge pump disabled, 2.6v < v dd < 5.5v MAX5394m MAX5394n +0.5 MAX5394l +1.0 dc performance (variable resistor mode) integral nonlinearity (note 4) r-inl charge pump enabled, 1.7v < v dd < 5.5v -1.0 +1.0 lsb charge pump disabled, 2.6v < v dd < 5.5v MAX5394m MAX5394n -1.0 +1.0 MAX5394l -1.5 +1.5 maxim integrated
MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer 3 electrical characteristics (continued) (v dd = 1.7v to 5.5v, v h = v dd , v l = gnd, t a = -40c to +125c, unless otherwise noted. typical values are at v dd = 1.8v, t a = +25c.) (note 2) parameter symbol conditions min typ max units differential nonlinearity r-dnl (note 4) -0.5 +0.5 lsb wiper resistance (note 5) r wl charge pump enabled, 1.7v < v dd < 5.5v 25 50 ? charge pump disabled, 2.6v < v dd < 5.5v 200 dc performance (resistor characteristics) terminal capacitance c h , c l measured to gnd 10 pf wiper capacitance c w measured to gnd 20 pf end-to-end resistor tempco t cr no load 50 ppm/c end-to-end resistor tolerance wiper not connected -25 +25 % ac performance -3db bandwidth bw code = 80h, 10pf load, v dd = 1.8v 10k? 1600 khz 50k? 340 100k? 165 total harmonic distortion plus noise thd+n (note 6) 0.035 % wiper settling time t s (note 7) 10k? 190 ns 50k? 400 100k? 664 charge-pump feedthrough at w v rw 600 nv rms power supplies supply voltage range v dd 1.7 5.5 v terminal voltage range (h, w, l to gnd) charge pump enabled, 1.7v < v dd < 5.5v 0 5.25 v charge pump disabled, 2.6v < v dd < 5.5v 0 v dd supply current (note 8) i vdd charge pump disabled, 2.6v < v dd < 5.5v 1 a charge pump enabled, 1.7v < v dd < 5.5v v dd = 5.5v 25 v dd = 1.7v 20 digital inputs minimum input high voltage v ih 2.6v < v dd < 5.5v 70 % x v dd 1.7v < v dd < 2.6v 80 maximum input low voltage v il 2.6v < v dd < 5.5v 30 % x v dd 1.7v < v dd < 2.6v 20 input leakage current -1 +1 a input capacitance 5 pf maxim integrated
MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer 4 note 2: all devices are production tested at t a = +25c and are guaranteed by design and characterization for t a = -40c to +125c. note 3: dnl and inl are measured with the potentiometer configured as a voltage-divider with v h = 5.25 (qp enabled) or v dd (qp disabled) and v l = gnd. the wiper terminal is unloaded and measured with an ideal voltmeter. note 4: r-dnl and r-inl are measured with the potentiometer configured as a variable resistor (figure 1). h is unconnected and l = gnd. for charge pump enabled, v dd = 1.7v to 5.5v, the wiper terminal is driven with a source current of 400a for the 10k? configuration, 80a for the 50k? configuration, and 40a for the 100k? configuration. for charge pump disabled and v dd = 5.5v, the wiper terminal is driven with a source current of 400a for the 10k? configuration, 80a for the 50k? configuration, and 40a for the 100k? configuration. for charge pump disabled and v dd = +2.6v, the wiper terminal is driven with a source current of 200a for the 10k? configuration, 40a for the 50k? configuration, and 20a for the 100k? configuration. note 5: the wiper resistance is the maximum value measured by injecting the currents given in note 4 into w with l = gnd. r w = (v w - v h )/i w . note 6: measured at w with h driven with a 1khz, 0v to v dd amplitude tone and v l = gnd. wiper at midscale with a 10pf load. note 7: wiper-settling time is the worst-case 0-to-50% rise time, measured between tap 0 and tap 127. h = v dd , l = gnd, and the wiper terminal is loaded with 10pf capacitance to ground. note 8: digital inputs at v dd or gnd. note 9: digital timing is guaranteed by design and characterization, and is not production tested. electrical characteristics (continued) (v dd = 1.7v to 5.5v, v h = v dd , v l = gnd, t a = -40c to +125c, unless otherwise noted. typical values are at v dd = 1.8v, t a = +25c.) (note 2) parameter symbol conditions min typ max units timing characteristics (note 9) sclk frequency f sclk 2.6v < v dd < 5.5v 50 mhz 1.7v < v dd < 2.6v 25 sclk period t sclk 2.6v < v dd < 5.5v 20 ns 1.7v < v dd < 2.6v 40 sclk pulse-width high t ch 8 ns sclk pulse-width low t cl 8 ns cs fall to sclk fall setup time t css0 to 1st sclk falling edge (fe) 2.6v < v dd < 5.5v 8 ns 1.7v < v dd < 2.6v 16 cs fall to sclk fall hold time t csh0 applies to inactive fe preceding 1st fe 0 ns cs rise to sclk fall hold time t csh1 applies to 16th fe 0 ns cs rise to sclk fall t csa applies to 16th fe, aborted sequence 2.6v < v dd < 5.5v 12 ns 1.7v < v dd < 2.6v 16 sclk fall to cs fall t csf applies to 16th fe 100 ns cs pulse-width high t cspw 20 ns din to sclk fall setup time t ds 5 ns din to sclk fall hold time t dh 4.5 ns cs pulse-width high t cspw 20 ns maxim integrated
MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer 5 figure 1. voltage-divider and variable resistor configurations figure 2. spi timing diagram w h l w n.c. l d in 15 din sclk t cspw d in 14 d in 13 d in 12 d in 11 d in 10 d in 9 d in 8 d in 2 d in 1 d in 0d in 15 cs t csh0 t css0 12 34 56 78 14 15 16 1 t ds t dh t cp t ch t cl t csa t csh1 t csf maxim integrated
6 typical operating characteristics (v dd = 1.8v, t a = +25nc, unless otherwise noted.) supply current vs. temperature MAX5394 toc01 temperature (c) supply current (a) 110 95 80 65 50 35 20 5 -10 -25 40 0 -40 125 5 10 15 20 25 30 35 v dd = 1.8v supply current vs. digital input voltage MAX5394 toc02 digital input voltage (v) supply current (a) 4 3 2 1 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 0 05 v dd = 5v (low-high) v dd = 3.3v (low-high) v dd = 1.8v (low-high) v dd = 1.8v (high-low) v dd = 3.3v (high-low) v dd = 5v (high-low) supply current vs. input voltage MAX5394 toc03 input voltage (v) 4.55 3.60 2.65 1.70 5.50 supply current (a) 40 0 5 10 15 20 25 30 35 t a = -40c t a = +25c t a = +125c resistance (w-to-l) vs. tap position (10ki ) MAX5394 toc04 tap position w-to-l resistance (ki) 1 2 3 4 5 6 7 8 9 10 0 0 256 224 192 128 160 64 96 32 resistance (w-to-l) vs. tap position (50ki ) MAX5394 toc05 tap position w-to-l resistance (ki) 5 10 15 20 25 30 35 40 45 50 0 0 256 224 192 128 160 64 96 32 resistance (w-to-l) vs. tap position (100ki ) MAX5394 toc06 tap position w-to-l resistance (ki) 10 20 30 40 50 60 70 80 90 100 0 0 256 224 192 128 160 64 96 32 wiper resistance vs. wiper voltage wiper voltage (v) wiper resistance (i) 0.5 0 5 0 1.0 MAX5394 toc07a v dd = 2.6v, qp off v dd = 5v, qp off 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 5 10 15 20 25 30 35 wiper resistance vs. wiper voltage wiper voltage (v) wiper resistance (i) 0.5 0 0 1.0 MAX5394 toc07b v dd = 1.8v, qp on 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 40 end-to-end resistance percentage change vs. temperature MAX5394 toc08 temperature (c) end-to-end resistance percentage change (%) 110 95 80 65 50 35 20 5 -10 -25 -0.2 -40 125 0 0.2 0.4 0.6 0.8 50ki 10ki 100ki MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer maxim integrated
7 typical operating characteristics (continued) (v dd = 1.8v, t a = +25nc, unless otherwise noted.) tap-to-tap switching transient (code 127 to 128 10ki ) MAX5394 toc09 v w-l 10mv/div v sclk 2v/div 200ns/div tap-to-tap switching transient (code 127 to 128 50ki ) MAX5394 toc10 v w-l 10mv/div v sclk 2v/div 200ns/div tap-to-tap switching transient (code 127 to 128 100ki ) MAX5394 toc11 v w-l 10mv/div v sclk 2v/div 200ns/div power-on transient (10ki ) MAX5394 toc12a v w-l 1v/div v dd 1v/div 10s/div power-on transient (50ki ) MAX5394 toc12b v w-l 1v/div v dd 1v/div 10s/div power-on transient (100ki ) MAX5394 toc12c v w-l 1v/div v dd 1v/div 10s/div MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer maxim integrated
8 typical operating characteristics (continued) (v dd = 1.8v, t a = +25nc, unless otherwise noted.) midscale frequency response (10ki ) frequency (hz) gain (db) 1m 100k 10k 1k 0.1k -20 -10 0 10 -30 0.01k 10m MAX5394 toc13 v dd = 1.8v v dd = 5v v in = 1v p-p c w = 10pf midscale frequency response (50ki ) frequency (hz) gain (db) 1m 100k 10k 1k 0.1k -20 -10 0 10 -30 0.01k 10m MAX5394 toc14 v dd = 1.8v v dd = 5v v in = 1v p-p c w = 10pf midscale frequency response (100ki ) frequency (hz) gain (db) 1m 100k 10k 1k 0.1k -20 -10 0 10 -30 0.01k 10m MAX5394 toc15 v dd = 1.8v v dd = 5v v in = 1v p-p c w = 10pf total harmonic distortion plus noise vs. frequency MAX5394 toc16 frequency (khz) thd+n (%) 10 1 0.1 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0 0.01 100 10k i 50ki 100ki variable-resistor dnl vs. tap position (10ki ) MAX5394 toc18a tap position dnl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 2.6v, v h = 2.6v, charge pump off v dd = 5.0v, v h = 5.0v, charge pump off charge-pump feedthrough at w MAX5394 toc17 frequency (mhz) 0.50 2.00 voltage (nv rms ) 100 200 300 400 500 600 700 800 900 1000 0 1.75 1.50 1.25 1.00 0.75 100k i 50k i 10k i variable-resistor dnl vs. tap position (50ki ) MAX5394 toc18b tap position dnl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 2.6v, v h = 2.6v, charge pump off v dd = 5.0v, v h = 5.0v, charge pump off variable-resistor dnl vs. tap position (100ki ) MAX5394 toc18c tap position dnl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 2.6v, v h = 2.6v, charge pump off v dd = 5.0v, v h = 5.0v, charge pump off variable-resistor inl vs. tap position (10ki ) MAX5394 toc19a tap position inl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 5.0v, v h = 5.0v, charge pump off v dd = 2.6v, v h = 2.6v, charge pump off MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer maxim integrated
9 voltage-divider inl vs. tap position (10ki ) MAX5394 toc21a tap position inl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 2.6v, v h = 2.6v, charge pump off v dd = 5.0v, v h = 5.0v, charge pump off voltage-divider dnl vs. tap position (100ki ) MAX5394 toc20c tap position dnl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 2.6v, v h = 2.6v, charge pump off v dd = 5.0v, v h = 5.0v, charge pump off variable-resistor inl vs. tap position (50ki ) MAX5394 toc19b tap position inl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 5.0v, v h = 5.0v, charge pump off v dd = 2.6v, v h = 2.6v, charge pump off variable-resistor inl vs. tap position (100ki ) MAX5394 toc19c tap position inl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 2.6v, v h = 2.6v, charge pump off v dd = 5.0v, v h = 5.0v, charge pump off voltage-divider dnl vs. tap position (10ki ) MAX5394 toc20a tap position dnl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 2.6v, v h = 2.6v, charge pump off v dd = 5.0v, v h = 5.0v, charge pump off voltage-divider dnl vs. tap position (50ki ) MAX5394 toc20b tap position dnl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 2.6v, v h = 2.6v, charge pump off v dd = 5.0v, v h = 5.0v, charge pump off voltage-divider inl vs. tap position (50ki ) MAX5394 toc21b tap position inl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 2.6v, v h = 2.6v, charge pump off v dd = 5.0v, v h = 5.0v, charge pump off voltage-divider inl vs. tap position (100ki ) MAX5394 toc21c tap position inl (lsb) -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 256 224 192 128 160 64 96 32 v dd = 1.8v, v h = 5.0v, charge pump on v dd = 2.6v, v h = 2.6v, charge pump off v dd = 5.0v, v h = 5.0v, charge pump off MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer maxim integrated
MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer 10 pin configuration pin description pin name function 1 l low terminal. the voltage at l can be greater than or less than the voltage at h. current can flow into or out of l. 2 gnd ground 3 cs active-low chip-select digital input 4 din serial-interface data input 5 sclk serial-interface clock input 6 v dd power supply 7 w wiper terminal 8 h high terminal. the voltage at h can be greater than or less than the voltage at l. current can flow into or out of h. ep exposed pad. internally connected to gnd. connected to ground. 1 + 3 4 8 6 5 h v dd sclk MAX5394 2 7 w l ep din gnd tdfn top view cs maxim integrated
MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer 11 functional diagram detailed description the MAX5394 single, 256-tap volatile, low-voltage linear taper digital potentiometer offers three end-to- end resistance values of 10k? , 50k? , and 100k? . potentiometer terminals are independent of supply for voltages up to +5.25v with single-supply operation from 1.7v to 5.5v (charge pump enabled). user-controlled shutdown modes allow the h, w, or l terminals to be opened with the wiper position set to zero-code, midcode, full-code, or the value contained in the wiper register. ultra-low-quiescent supply current (< 1a) can be achieved for supply voltages between 2.6v and 5.5v by disabling the internal charge pump and not allowing potentiometer terminals to exceed the supply voltage by more than 0.3v. the MAX5394 provides a low 50ppm/c end-to-end temperature coefficient and features a spi serial interface. the small package size, low supply operating voltage, low supply current, and automotive temperature range of the MAX5394 make the device uniquely suited for the portable consumer market, battery-backup industrial applications, and automotive market. charge pump the MAX5394 contains an internal charge pump that guarantees the maximum wiper resistance, r wl , to be less than 50? (25? typ) for supply voltages down to 1.7v and allows pins h, w, and l to be driven between gnd and 5.25v independent of v dd . minimal charge- pump feedthrough is present at the terminal outputs and is illustrated by the charge-pump feedthrough at w vs. frequency graph in the typical operating characteristics. the charge pump is on by default but can be disabled with qp_off and enabled with the qp_on commands (table 1). the MAX5394 minimum supply voltage with charge pump disabled is limited to 2.6v and terminal voltage cannot exceed -0.3v to (v dd + 0.3v). spi interface the digital interface is powered from v dd , not the internal charge-pump voltage. therefore the v ih and v il logic thresholds will follow v dd as specified in the electrical characteristics table. the spi digital interface uses a 3-wire serial data interface to control the wiper tap position. this write-only interface contains three inputs: chip select (cs), data in (din), and data clock (sclk). when cs is taken low, data from the din pin is synchronously loaded into the serial shift register on each falling edge of each sclk pulse (figure 3). after all the data bits have been shifted in, they are latched into the potentiometer control register. data written to a memory register immediately updates the wiper position. keep cs low during the entire data stream to prevent the data from being terminated. the power-on default position of the wiper is midscale (d[7:0] = 80h). figure 3. spi digital interface format h l cs gnd din w v dd sclk MAX5394 spi interface c7 din sclk c6 c5 c4 c3 c2 c1 c0 d7 d6 d5 d4 d3 wiper register loaded d2 d1 d0 cs maxim integrated
MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer 12 wiper command the data byte writes to the wiper register and the potentiometer moves to the appropriate position. d[7:0] indicates the position of the wiper. d[7:0] = 0x00 moves the wiper to the position closest to l. d[7:0] = 0xff moves the wiper closest to h. d[7:0] = 0x80 following power-on. sd_clr command removes any existing shutdown condition. connects all potentiometer terminals and returns the wiper to the value stored in the wiper register. the command does not affect the current status of the charge pump. sd_h_wreg command opens the h terminal and maintains the wiper at the wiper register location. writes cannot be made to the wiper register while shutdown mode is engaged. clearing shutdown mode will close the h terminal and allow the wiper register to be written. a rst will also deassert shutdown mode and return the wiper to midscale (0x80). this command does not affect the charge-pump status. sd_h_zero command moves wiper to zero-scale position (0x00) and opens the h terminal. the wiper register remains unaltered. writes cannot be made to the wiper register while shutdown mode is engaged. clearing shutdown mode will return the wiper to the position contained in the wiper register and close the h terminal. a rst will also deassert shutdown mode and return the wiper to midscale (0x80). this command does not affect the charge-pump status. sd_h_mid command moves wiper to midscale position (0x80) and opens the h terminal. the wiper register remains unaltered. writes cannot be made to the wiper register while shutdown mode is engaged. clearing shutdown mode will return the wiper to the position contained in the wiper register and close the h terminal. a rst will also deassert shutdown mode and return the wiper to midscale (0x80). this command does not affect the charge-pump status. sd_h_full command moves wiper to full-scale position (0xff) and opens h terminal. the wiper register remains unaltered. writes cannot be made to the wiper register while shutdown mode is engaged. clearing shutdown mode will return the wiper to the position contained in the wiper register and close the h terminal. a rst will also deassert shutdown mode and return the wiper to midscale (0x80). this command does not affect the charge-pump status. sd_l_wreg command opens the l terminal and maintains the wiper at the wiper register location. writes cannot be made to the wiper register while shutdown mode is engaged. clearing shutdown mode will close the l terminal and allow wiper table 1. spi write command byte summary command command byte data byte c7 c6 c5 c4 c3 c2 c1 c0 d7 d6 d5 d4 d3 d2 d1 d0 wiper 0 0 0 0 0 0 0 0 d7 d6 d5 d4 d3 d2 d1 d0 sd_clr 1 0 0 0 0 0 0 0 x x x x x x x x sd_h_wreg 1 0 0 1 0 0 0 0 x x x x x x x x sd_h_zero 1 0 0 1 0 0 0 1 x x x x x x x x sd_h_mid 1 0 0 1 0 0 1 0 x x x x x x x x sd_h_full 1 0 0 1 0 0 1 1 x x x x x x x x sd_l_wreg 1 0 0 0 1 0 0 0 x x x x x x x x sd_l_zero 1 0 0 0 1 0 0 1 x x x x x x x x sd_l_mid 1 0 0 0 1 0 1 0 x x x x x x x x sd_l_full 1 0 0 0 1 0 1 1 x x x x x x x x sd_w 1 0 0 0 0 1 x x x x x x x x x x qp_off 1 0 1 0 0 0 0 0 x x x x x x x x qp_on 1 0 1 0 0 0 0 1 x x x x x x x x rst 1 1 0 0 0 0 0 0 x x x x x x x x maxim integrated
MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer 13 register to be written. a rst will also deassert shutdown mode and return the wiper to midscale (0x80). this command does not affect the charge-pump status. sd_l_zero command moves wiper to zero-scale position (0x00) and opens the l terminal. the wiper register remains unaltered. writes cannot be made to the wiper register while shutdown mode is engaged. clearing shutdown mode will return the wiper to the position contained in the wiper register and close the l terminal. a rst will also deassert shutdown mode and return the wiper to midscale (0x80). this command does not affect the charge-pump status. sd_l_mid command moves wiper to midscale position (0x80) and opens the l terminal. the wiper register remains unaltered. writes cannot be made to the wiper register while shutdown mode is engaged. clearing shutdown mode will return the wiper to the position contained in the wiper register and close the l terminal. a rst will also deassert shutdown mode and return the wiper to midscale (0x80). this command does not affect the charge-pump status. sd_l_full command moves wiper to full-scale position (0xff) and opens the l terminal. the wiper register remains unaltered. writes cannot be made to the wiper register while shutdown mode is engaged. clearing shutdown mode will return the wiper to the position contained in the wiper register and close the l terminal. a rst will also deassert shutdown mode and return the wiper to midscale (0x80). this command does not affect the charge-pump status. sd_w command opens the w terminal keeping the internal tap position the same as the wiper register. writes cannot be made to the wiper registers while shutdown mode is engaged. clearing shutdown mode will return the wiper to the position contained in the wiper register and close w terminal. a rst will also deassert shutdown mode and return the wiper to midscale (0x80). this command does not affect the charge-pump status. qp_on command enables the onboard charge pump to allow low-supply voltage operation. this is the power-on default condition. low supply voltage is 1.7v. qp_off command disables the on-board charge pump and places device in low power mode. low supply voltage is limited to 2.6v. rst command returns device to power-on default conditions. resets the wiper register to midscale (0x80), enables charge pump, and deasserts any shutdown modes. maxim integrated
MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer 14 ordering information note: all devices operate over the -40c to +125c temperature range. +denotes a lead(pb)-free/rohs-compliant package. *ep = exposed pad. chip information process: bicmos package information for the latest package outline information and land patterns (foot- prints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. part pin-package interface taps end-to-end resistance (ki) MAX5394lata+t 8 tdfn-ep* spi 256 10 MAX5394mata+t 8 tdfn-ep* spi 256 50 MAX5394nata+t 8 tdfn-ep* spi 256 100 package type package code outline no. land pattern no. 8 tdfn-ep t822+2 21-0168 90-0065 maxim integrated
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 15 ? 2012 maxim integrated products, inc. the maxim logo and maxim integrated are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 7/12 initial release 1 9/12 revised the absolute maximum ratings 2 MAX5394 single, 256-tap volatile, spi, low-voltage linear taper digital potentiometer

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