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rev.1.00 mar 04, 2005 page 1 of 23 M61048FP battery protection analog front end (afe) ic rej03f0129-0100 rev.1.00 mar 04, 2005 description the M61048FP is intended to be used as sb: smart battery. all functions needed for sb are packed to this M61048FP. the combination use with microcomputer such as m37512 will give various functions such as a detection of sb remaining capacity. the reset circuit and the linear regulator for vcc/vref of microcomputer are dedicated in M61048FP. so this will help easy design of power circuit design of sb. features ? all fets are controlled by microcomputer ? built-in low dropout series regulator for microcomputer ? built-in battery voltage monitor circuit of each battery cell ? built-in output selector, which outputs the voltage each selected battery cell ? built-in discharge circuit of each battery cell ? built-in voltage detection circuit of each battery cell ? built-in fet off function controlled by microcomputer ? various powers saving function to reduce total power dissipation ? 3-wire serial data transfer system for communication from microcomputer ? high input voltage device (absolute maximum rating: 33 v) ? cmos monolithic ic application ? smart battery system block diagram multiplexer circuit reset circuit series regulator serial to parallel conversion circuit battery cell 1-4 voltage analog output battery cell voltage detection circuit fet control circuit vcc vin12 cfet pcfet vreg vin1 dfetcnt cfetcnt dfet vin2 vin3 vin4 gnd reset cs ck di analog
M61048FP rev.1.00 mar 04, 2005 page 2 of 23 pin arrangement (top view) package: plsp0020jb-a (20p2f-a) 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 cs cfetcnt vin1 vin2 vin3 vin4 reset vin12 n.c. dfetcnt ck di a nalog cfet dfet pcfet gnd vreg n.c. vcc M61048FP pin description pin no. pin name function 10 vcc power source pin. power from charger or battery 8 vreg linear-regulator output for microcomputer 13 vin12 monitoring charger is connected or not 18 vin1 battery 1 + voltage input 17 vin2 battery 1 ? voltage and battery 2 + voltage input 16 vin3 battery 2 ? voltage and battery 3 + voltage input 15 vin4 battery 3 ? voltage and battery 4 + voltage input 7 gnd ground and battery 4 - voltage input 5 dfet discharge fet-drive output. the driver is turned off by microcomputer 4 cfet charge fet-drive output. the driver is turned off by microcomputer 6 pcfet pre-charge fet-drive output. the driver is turned off by microcomputer 14 reset reset signal output to reset of microcomputer 3 analog various analog signal outputs to ad-input of microcomputer 19 cfetcnt input of cfet and pcfet control signal from microcomputer 11 dfetcnt input of dfet control signal from microcomputer 20 cs during low signal input to this cs, data input to di is enabled 1 ck input of shift clock from microcomputer. di's input data is latched by low-to-high edge of this ck 2 di input of 6-bit length serial data from microcomputer
M61048FP rev.1.00 mar 04, 2005 page 3 of 23 absolute maximum ratings item symbol ratings unit condition absolute maximum rating vabs 33 v supply voltage vcc 30 v power dissipation pd 800 mw operating temperature range topr1 ?20 to +85 c storage temperature range tstg ?40 to +125 c ck di cs tscs thcs thdi reference period tsdi figure 1 interface timing
M61048FP rev.1.00 mar 04, 2005 page 4 of 23 electrical characteristics (ta = 25c, vcc = 14 v, unless otherwise noted) block item symbol min. typ. max. unit circuit condition supply voltage vsup ? ? 30 v 1 supply current 1 isup 35 75 115 a 1 supply current 2 ips 20 45 70 a 1 power save mode (battery voltage detection: off) total supply current 3 ipd ? ? 0.5 a 1 power down mode 2.475 2.5 2.525 v 2 vcc = 14v, iout = 10ma output voltage vreg 4.75 5.0 5.25 v 2 vcc = 14v, iout = 10ma ? 2 10 mv 2 vreg = 2.5v vcc = 6.0v to 24v, iout = 10ma linear regulation ? vline ? 4 100 mv 2 vreg = 5.0v vcc = 7.5v to 24v, iout = 10ma ? 3 15 mv 2 vreg = 2.5v vcc = 6.0v, iout = 50 a to 10ma regulator load regulation ? vload ? 5 150 mv 2 vreg = 5.0v vcc = 7.5v, iout = 50 a to 50ma detection voltage vdet? 1.9 2.0 2.1 v 3 vreg = 2.5v reset release voltage vdet+ 2.1 2.2 2.3 v 3 vreg = 2.5v input offset voltage voff 31 206 385 mv 4 voltage gain gamp 0.396 0.400 0.404 ? 4 vreg = 2.5v output source current isource 75 ? ? a 5 output sink current isink 150 ? ? a 5 battery voltage detection detection voltage of battery cell vmo_max 4.7 ? ? v 2, 4 (vreg?voff1)/gamp di input h voltage vdih vreg?0.5 ? vreg v 6 di input l voltage vdil 0 ? 0.5 v 6 cs input h voltage vcsh vreg?0.5 ? vreg v 6 cs input l voltage vcsl 0 ? 0.5 v 6 ck input h voltage vckh vreg?0.5 ? vreg v 6 ck input l voltage vckl 0 ? 0.5 v 6 di set-up time tsdi 600 ? ? ns 6 di hold time thdi 600 ? ? ns 6 cs set-up time tscs 600 ? ? ns 6 cs hold time thcs 600 ? ? ns 6 dfetcnt input h voltage vdch vreg?0.5 ? vreg v 6 dfetcnt input l voltage vdcl 0 ? 0.5 v 6 cfetcnt input h voltage vcch vreg?0.5 ? vreg v 6 cfetcnt input l voltage vccl 0 ? 0.5 v 6 cfetcnt sink current icch 0.3 1 2 a 6 cfetcnt = 2.5v interface vin12 input threshold voltage v12 0.5 vcc ? 0.95 vcc v vcc = 6.0 v to 24 v vin1 resistor ron1 250 500 1000 ? 7 vin2 resistor ron2 250 500 1000 ? 7 vin3 resistor ron3 250 500 1000 ? 7 conditio- ning circuit vin4 resistor ron4 250 500 1000 ? 7
M61048FP rev.1.00 mar 04, 2005 page 5 of 23 measurement circuit measurement circuit 1 cfet pcfet dfet ipd, ips, isup gnd vin4 vin3 vin2 vin1 vcc ck di cs analog vreg vin12 a measuring ipd: off except above: on measuring ipd: on except above: off 0.47 f measurement circuit 2 cfet pcfet dfet i (vreg) gnd vin4 vin3 vin2 vin1 vcc ck di cs analog vreg vin12 0.47 f v data input 0.5v ? vreg?0.5v data input 0.5v ? vreg?0.5v
M61048FP rev.1.00 mar 04, 2005 page 6 of 23 measurement circuit 3 cfet pcfet dfet gnd vin4 vin3 vin2 vin1 vcc ck di cs analog vreg reset vin12 measurement circuit 4 cfet pcfet dfet gnd vin4 vin3 vin2 vin1 vcc ck di cs analog vreg vin12 0.47 f v1 v2 v3 v4 v v data input 0.5v ? vreg?0.5v data input 0.5v ? vreg?0.5v
M61048FP rev.1.00 mar 04, 2005 page 7 of 23 measurement circuit 6 cfet pcfet dfet gnd vin4 dfetcnt cfetcnt vin3 vin2 vin1 vcc ck di cs analog vreg vin12 2.5v 14v a measurement circuit 5 cfet pcfet dfet gnd vin4 vin3 vin2 vin1 vcc ck di cs analog vreg vin12 0.47 f v1 v2 v3 v4 a isource isink a a a a data input 0.5v ? vreg?0.5v
M61048FP rev.1.00 mar 04, 2005 page 8 of 23 measurement circuit 7 cfet pcfet dfet gnd vin4 vin3 vin2 vin1 vcc ck di cs analog vreg vin12 0.47 f v1 v2 v3 v4 a a a a data input 0.5v ? vreg?0.5v
M61048FP rev.1.00 mar 04, 2005 page 9 of 23 operation description M61048FP is developed for intelligent li-ion battery pack su ch as sb in sbs. M61048FP is suitabl e for smart battery. pair using with microcomputer such as m37512 and small add itional parts will give various functions such as battery remaining capacity detection. all functions are described as follows. note: sbs: smart battery system introduced by intel and duracell sb: smart battery, which contains 3 or 4 series li-ion battery cells. voltage detection circuit of each li-ion battery cell M61048FP can output each battery cell's voltage of 3 or 4 se ries connection. built-in buffer amplifier is monitoring each battery voltage. series regulator M61048FP contains low drop out series regu lator. microcomputer in sb does not need any additional voltage regulator. usually, although series regulator is 2.5 v output, it is possible to change to 5 v output by register setup at the time of flash memory rewriting of microcomputer. reset circuit vreg output voltage is checked by reset circuit of M61048FP. therefore, lower voltage of vreg issues reset signal to stop mull-function of microcomputer. also, lower voltage after long time's left issues reset signal to stop mull- function of microcomputer. this function is useful for safety of long time's left battery. when charger is connected to sb, this circuit will check vreg voltage, so if vreg voltage is not enough high, this circuit remains low as for reset signal to microcomputer. conditioning circuit M61048FP have a discharge circuit of each cells. it is available for drop of cell voltage for safety purpose. and to shorten the difference voltage among the cells. it can extend the battery pack life. power save function M61048FP contains power save function to control several supply current. it can operate in the three state, usual mode, power save mode, and power down mode. these three modes can be changed by the command from a microcomputer, and can control the consumption current in each mode. 1. usual mode it is in the state where all circuits are operating. 2. power save mode in power save mode, consumption current is reduced by stopping voltage detection circuit, and outputting alalog output with gnd level. if analog output is changed to the battery voltage output or offset voltage output of each cell by the command from a microcomputer, it will change to usual mode. in addition, the regulator circuit is operating in a power save mode. 3. power down mode in power down mode, all circuits will be stopped. the shift to power down mode and operation at the time of resume from power down mode are explained below using figure 2.
M61048FP rev.1.00 mar 04, 2005 page 10 of 23 ? enter power down mode microcomputer issues power down command to M61048FP after microcomputer detects that battery voltage is too low. after this command, the dfet pin is set to 'high' and the vin12 pin is pulled down by internal resistor to be set 'low' and series regulator are turned off. in the power down mode, the M61048FP operation is impossible. and cfet, dfet and pcfet are set to 'high'. (in this situation, discharging is forbidden.) at this time, supply current becomes max. 0.5 a, so drops of battery voltage is prevented. ? resume from power down mode after entering power down mode, the series regulator will begin operation when charger is connected (vin12 pin is high). the reset will output low to high signal when vreg is over reset level voltage. microcomputer will begin operation and send command to resume M61048FP from power down mode. reset circuit cs reset dfetcnt vreg vin1 vin12 gnd level in discharging series regulator cfetcnt ck di serial to pallarel conversion circuit dfet vcc cfet pcfet fet control circuit figure 2 function after detecting over-discharge
M61048FP rev.1.00 mar 04, 2005 page 11 of 23 block diagram description battery voltage detection circuit the M61048FP battery voltage detection circuit is shown in figure 3. this circuit is composed of switch, buffer amplifier, reference voltage section and logic circuit. microcomputer selects detecting voltage before logic circuit controls the connection of switches. this connection decides which cell voltage (vbat1, vbat2, vbat3, vbat4) should be output from analog out pin. besides offset voltage can be output. in power down mode, supply current in this block is close to zero because all switches are off. note: regard 100 s as the standard of settling time by voltage change in this block. ? + logic circuit vref vin1 vin2 vin3 vbat1 s11 s21 s22 s32 from serial to parallel conversion circuit switch control to multiplexer circuit s31 s42 s41 vin4 gnd s02 s01 vbat2 vbat3 vbat4 figure 3 battery voltage detection circuit table 1 turned on switches function turn on switch (refer to figure 3) vbat1_output s11, s22 vbat2_output s21, s32 vbat3_output s31, s42 vbat4_output s41, s02 vbat1_offset s21, s22 vbat2_offset s31, s32 vbat3_offset s41, s42 vbat4_offset s01, s02
M61048FP rev.1.00 mar 04, 2005 page 12 of 23 analog output selector analog output selector block is shown in figure 4. the command from microcomputer determines whether gnd is outputted to an analog terminal, or the voltage chosen in the battery voltage detection circuit is outputted. at the time of gnd output, since the battery voltage detection circuit stops, M61048FP goes into power save mode. from serial to parallel conversion circuit a nalog ? + battery voltage detection circuit analog output selector vref figure 4 analog output selector
M61048FP rev.1.00 mar 04, 2005 page 13 of 23 series regulator series regulator is shown in figure 5. pch mos transistor is used for output driver. the output voltage can be adjusted by M61048FP itself. so the external resistor is not required. usually, although series regulator is 2.5 v output, it is possible to change to 5 v output by register setup at the time of flash memory rewriting of microcomputer. note: there is a diode put between vcc and vreg terminal to prevent the invert current from damaging this ic when vcc voltage is higher than vreg voltage. so please always keep vreg voltage lower than vcc+0.3 v. set a condenser on output to suppress input changes or load changes. in order to suppress input change and load change, please attach a 0.47 f capacitor to vreg output. regard 10 ms as the standard of settling time by input change/load change/output change. + ? s52 s51 vref gnd r1 r2 r3 serial to parallel conversion circuit vreg vcc switch control figure 5 series regulator
M61048FP rev.1.00 mar 04, 2005 page 14 of 23 reset circuit the M61048FP reset circuit is shown in figure 6. this circuit is composed of comparator, reference voltage section and breeder resistor. hysterics is given to detection voltage and release voltage. the reset output is nch open drain structure so the reset delay time depends on external cr value. the reset circuit monitoring vreg output to prevent microcomputer abnormal operation when vcc voltage goes down abnormally. + ? vref gnd rh reset r2 r1 vreg vreg figure 6 reset circuit
M61048FP rev.1.00 mar 04, 2005 page 15 of 23 conditioning circuit the M61048FP conditioning circuit is shown in figure 7. this circuit is composed of switch, resistor and logic circuit. according to the serial data from microcomputer, the logi c circuit can individually control the switches (s61, s62 ? etc.) to do individual cell discharge. moreover, it is possible to also make from 1 cell to 4 cells discharge similarly by sending serial data two or more times. vin1 vin2 s61 r61 s62 r62 s63 r63 s64 r64 vin3 vin4 gnd vbat1 vbat2 vbat3 vbat4 logic circuit from serial to parallel conversion circuit switch control figure 7 conditioning circuit
M61048FP rev.1.00 mar 04, 2005 page 16 of 23 resister map address table 2 address data establishment data d5 d4 d3 d2 d1 d0 contents reset 0 0 0 ? ? ? ? battery voltage output 0 0 1 ? ? ? refer to table 3 fet control 0 1 0 ? ? ? refer to table 4 multiplexer select 0 1 1 ? ? ? refer to table 5 regulator 1 0 0 ? ? ? refer to table 6 conditioning circuit 1 0 1 ? ? ? refer to table 7 don?t care 1 1 0 ? ? ? ? don?t care 1 1 1 ? ? ? ? data table 3 battery voltage output d2 d1 d0 name function 0 0 0 vbat1_output bat1 voltage monitor 0 0 1 vbat2_output bat2 voltage monitor 0 1 0 vbat3_output bat3 voltage monitor 0 1 1 vbat4_output bat4 voltage monitor 1 0 0 vbat1_offset offset voltage output at bat1 monitor 1 0 1 vbat2_offset offset voltage output at bat2 monitor 1 1 0 vbat3_offset offset voltage output at bat3 monitor 1 1 1 vbat4_offset offset voltage output at bat4 monitor note: analog terminal output gnd level when system reset. (all switches for battery voltage detect circuit are turned off.) regard 100 s as the standard of settling time by each change of analog output. table 4 fet control function d2 d1 d0 name cfet dfet pcfet 0 0 0 fcnt_ah high high high 0 0 1 fcnt_pl high high low 0 1 0 fcnt_dl high low high 0 1 1 fcnt_ch high low low 1 0 0 fcnt_cl low high high 1 0 1 fcnt_dh low high low 1 1 0 fcnt_ph low low high 1 1 1 fcnt_al low low low note: cfet, dfet and pcfet terminal are high when system reset.
M61048FP rev.1.00 mar 04, 2005 page 17 of 23 table 5 multiplexer control (analog output control) d2 d1 d0 name function notes 0 0 0 mp_gnd1 gnd output bat1 voltage monitor 0 0 1 mp_run battery voltage output select 0 1 0 mp_gnd2 gnd output all switches for battery voltage detect are off. 0 1 1 mp_gnd3 gnd output bat4 offset voltage 1 0 0 ? don?t care 1 0 1 ? don?t care 1 1 0 ? don?t care 1 1 1 ? don?t care note: analog terminal output gnd level when system reset. regard 100 s as the standard of settling time by each change of analog output. table 6 regulator d2 d1 d0 name function notes 0 0 0 vreg_25 vreg = 2.5 v 0 0 1 vreg_off vreg = 0 v (regulator turned off) power down command 0 1 0 vreg_50 vreg = 5.0 v 0 1 1 vreg_25 vreg = 2.5 v 1 0 0 don?t care 1 0 1 don?t care 1 1 0 don?t care 1 1 1 don?t care note: the regulator output 2.5 v when system reset. all functions of M61048FP are stopped. but if the charger is connected then M61048FP will not enter power down mode. regard 20 ms as the standard of settling time by change of vreg output. table 7 conditioning circuit function d2 d1 d0 name bat1_sw bat2_sw bat3_sw bat4_sw 0 0 0 cd_off off off off off 0 0 1 cd_ron11 on don?t care don?t care don?t care 0 1 0 cd_ron21 don?t care on don?t care don?t care 0 1 1 cd_ron31 don?t care don?t care on don?t care 1 0 0 cd_ron41 don?t care don?t care don?t care on 1 0 1 cd_ron12 on don?t care don?t care don?t care 1 1 0 cd_ron22 don?t care on don?t care don?t care 1 1 1 cd_ron32 don?t care don?t care on don?t care note: conditioning circuit is floating when system reset. by transmitting data two or more times, bat1 to bat4 arbitrary cells can be turned on simultaneously.
M61048FP rev.1.00 mar 04, 2005 page 18 of 23 digital data format the block diagram of the serial to parallel conversion circuit of serial data transmission is shown in figure 8, and a timing chart is shown in figure 9, respectively. after setting cs terminal to low, serial data is read into the inside of ic in an order from lsb (d0) synchronizing with the stand-up of ck terminal. if cs terminal is set to high when it inputs by 6 bits, the contents of a 6-bit shift register are latched to an internal latch circuit after serial to parallel conversion. d5 6-bit shift register address decoder cs ck di first last d4 d3 lsb msb d2 d1 d0 latch latch latch latch latch battery voltage output multiplexer control conditioning control fet control vreg control mpx mpx mpx mpx mpx figure 8 serial to parallel conversion circuit di d0 lsb msb d1 d2 d3 d4 d5 ck cs figure 9 timing chart direct fet control it is possible to control direct fet by sending a signal to dfetcnt terminal or cfetcnt terminal other than serial data transmission from a microcomputer. if dfetcnt terminal is set to high, dfet terminal will be set to high, and if cfetcnt terminal is set to high, cfet terminal and pcfet terminal will be set to high. priority is given to this function regardless of serial data communications.
M61048FP rev.1.00 mar 04, 2005 page 19 of 23 timing chart charging sequence 0 1 2 3 4 5 0 5 10 15 20 cfet (v) 0 5 10 15 20 dfet (v) 0 5 10 15 20 battery voltage (v) battery voltage (v) from bottom: vbat1, vbat2, vbat3, vbat4 vcc pin vin_1 pin instruction from microprocessor instruction from microprocessor instruction from microprocessor end of charging start of charging start of charging vbat4 reaches overcharge detect voltage off during initialization off during initialization charging time vreg, reset (v) 0 1 2 3 4 0 1 2 3 analog (v) vbat1 monitor vbat3 monitor vbat2 monitor vbat4 monitor reset vreg charger connected microprocessor operation start instruction from microprocessor note: a constant voltage battery charger is used. 0 5 10 15 20 pcfet (v) off during initialization instruction from microprocessor end of charging instruction from microprocessor start of precharging
M61048FP rev.1.00 mar 04, 2005 page 20 of 23 discharge sequence 0 1 2 3 4 5 0 5 10 15 20 cfet (v) 0 5 10 15 20 pcfet (v) 0 5 10 15 20 dfet (v) 0 5 10 15 20 discharge time self-discharge time off in power-down mode vcc pin vin_1 pin battery voltage (v) battery voltage (v) from top: vbat1, vbat2, vbat3, vbat4 instruction from microprocessor instruction from microprocessor instruction from microprocessor vin_12 pin pulled down to ground potential when discharge prohibited end of discharge vbat4 reaches excess discharge detect voltage vreg, reset (v) 0 1 2 3 4 0 1 2 3 analog (v) vreg reset vbat1 monitor vbat3 monitor vbat2 monitor vbat4 monitor system stop instruction from microprocessor
M61048FP rev.1.00 mar 04, 2005 page 21 of 23 application circuit M61048FP mcu m37512fchp ? terminal vreg 0.47 f 0.22 f vbat1 vbat2 vbat3 vbat4 1k ? vin1 reset dfetcnt analog cfetcnt vin12 dfet vcc cfet pcfet + terminal 0.22 f 1k ? 10k ? 6.8 ? vin2 vin3 vin4 gnd 0.22 f 1k ? 0.22 f 1k ? 0.22 f 1k ? cs ck di figure 10 application circuit for 4 cell battery
M61048FP rev.1.00 mar 04, 2005 page 22 of 23 M61048FP vreg 0.47 f vbat2 vbat3 vbat4 vin1 reset dfetcnt analog cfetcnt vin12 dfet vcc cfet pcfet 0.22 f 1k ? 10k ? 6.8 ? vin2 vin3 vin4 gnd 0.22 f 1k ? 0.22 f 1k ? 0.22 f 1k ? cs ck di mcu m37512fchp ? terminal + terminal figure 11 application circuit for 3 cell battery
M61048FP rev.1.00 mar 04, 2005 page 23 of 23 package dimensions y index mark 1 10 11 20 f * 1 * 3 * 2 c b p e a d e h e include trim offset. dimension " * 3" does not note) do not include mold flash. dimensions " * 1" and " * 2" 1. 2. detail f a 1 a 2 l 0.32 0.22 0.17 b p previous code jeita package code renesas code plsp0020jb-a 20p2f-a mass[typ.] 0.1g p-lssop20-4.4x6.5-0.65 0.2 0.15 0.13 max nom min dimension in millimeters symbol reference 6.6 6.5 6.4 d 4.5 4.4 4.3 e 1.15 a 2 6.6 6.4 6.2 1.45 a 0.2 0.1 0 0.7 0.5 0.3 l 10 0 c 0.65 e 0.10 y h e a 1 0.53 0.77
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