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1 pmw3901mb product datasheet optical motion tracking chip pixart imaging inc. pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without per mission. version 1.10 | 20 june 2017 PMW3901MB-TXQT : optical motion tracking chip product datasheet general description the PMW3901MB-TXQT is pixart imaging's latest optical navigation chip designed with far field optics technology that enables navigation in the air. it is housed in a 28-pin chip- on -board (cob) package that provides x-y motion information with a wide working range of 80 mm to infinity. it is most suitable for far field ap plication for motion detection. key features ? wide working range from 80 mm to infinity ? no lens focusing required during lens mounting process ? p ow er consumption of < 9 ma @ run mode ? 16-bits motion data registers ? motion detect pin output ? internal oscillator C no clock input needed applications ? devices that require far field motion detection, e.g drone ? indoor and outdoor x-y positioning especially in gps denied environment key parameters parameter value supply voltage (v) v dd : 1.8 C 2.1 v dd io : 1.8 C 3.6 working range (mm) 80 to infinity interface 4 - wire spi @ 2 mhz package type 2 8 - pin cob package with l ens assembly : 6 x 6 x 2.2 8 mm ordering information part number package type pmw3901mb - txqt 2 8 - pin cob p ackage ln03 - zsz lens assembly for any additional inquiries, please contact us at http://www.pixart.com/contact.asp pixart confidential
2 pixart imaging inc. pmw3901mb product datasheet optical motion tracking chip version 1.10 | 20 june 2017 pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission. signal description figure 1 . pin configuration table 1 . signal pins description pin no. signal name type description functional group: power supplies 2 vdd power input power supply 3 vddio power i/o reference voltage 4 vreg power internal voltage output 1 gnd ground ground 21 gnd ground ground functional group: control interface 16 mosi input serial data input 17 sclk input serial data clock 18 miso output serial data output 19 ncs input chip select functional group: functional i/o 7 nreset input hardware reset (active low) 15 motion output motion interrupt (active low) 20 led_n input external led control pin (active low) ( refer appendix b for more details) functional group: special function pin 5 - 6 nc nc no connection (float) 8 - 14 nc nc no connection (float) 22 - 28 nc nc no connection (float) 29* gnd pad ground pad bottom of cob package must be connected to circuit ground pixart confidential
3 pixart imaging inc. pmw3901mb product datasheet optical motion tracking chip version 1.10 | 20 june 2017 pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission. operating specifications 2.1 absolute maximum ratings table 2 . absolute maximum ratings parameters symbol min. max. unit notes storage temperature t s - 40 85 c lead - free solder temperature t solder 260 c supply voltage v dd - 0. 5 2.1 v v ddio - 0.5 3 .6 v input voltage v in - 0.5 3.6 v all i/o pins esd esd hbm 2 kv all pins (human body model) notes: 1. maximum ratings are those values beyond which damage to the device may occur. 2. exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. functional operation under absolute maximum-rated conditions is not implied. 3. functional operation should be restricted to the recommended operating conditions. 2.2 recommended operating conditions table 3 . recommended operating conditions description symbol min. typ. max. unit notes operating temperature t a 0 4 0 c power supply voltage v dd 1.8 2.0 2.1 v including supply noise v ddio 1.8 2.0 3.6 v v ddio v dd power supply rise time t rt 0.15 20 ms 0 to v dd min supply noise (sinusoidal) v na 100 mv p - p 10 khz C 75 mhz serial port clock frequency f sclk 2 mhz 50% duty cycle working range z 80 mm effective viewing angle v a 42 illuminance lx 60 lux tested u nder floresce nt light on crimson carpet, light grey vinyl & light grey cement surfaces. speed s 7.4 rad/s note: pixart does not guarantee the performance o f the system beyond the recommended operating condition limits. pixart confidential
4 pixart imaging inc. pmw3901mb product datasheet optical motion tracking chip version 1.10 | 20 june 2017 pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission. 2.3 dc characteristics table 4 . dc electrical specifications parameters symbol min. typ. max. unit condition s supply current i dd_run 9 ma average current. no load on miso, motion. power down current i pd 12 ua input low voltage v il 0.3*v ddio v sclk, mosi, ncs input high voltage v ih 0.7 *v ddio v sclk, mosi, ncs input hysteresis v i_hys 100 mv sclk, mosi, ncs input leakage current i leak 1 10 ua v in = v ddio or 0v, sclk, mosi, ncs output low voltage v ol 0. 45 v i out = 1ma, miso, motion output high voltage v oh v ddio - 0. 45 v i out = - 1ma, miso, motion note: all the parameters are tested under operating conditions: v dd = 2.0v, v ddio = 2.0v, t a = 25c. pixart confidential
5 pixart imaging inc. pmw3901mb product datasheet optical motion tracking chip version 1.10 | 20 june 2017 pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission. 2.4 ac characteristics table 5 . ac electrical specifications parameters symbol min. typ. max. unit condition s motion delay after reset t mot - rst 50 ms from reset to valid motion, assuming motion is present shutdown t stdwn 500 us from shutdown mode active to low current wake from shutdown t wakeup 50 ms from shutdown mode inactive to valid motio n. notes: a reset must be asserted after a shutdown. refer to section notes on shutdown, also note t mot - rst . miso rise time t r - miso 50 ns c l = 100pf miso fall time t f - miso 50 ns c l = 100pf miso delay after sclk t dly - miso 120 ns from sclk falling edge to miso data valid, no load conditions miso hold time t hold - miso 200 ns data held until next falling sclk edge mosi hold time t hold - mosi 200 ns amount of time data is valid after sclk rising edge mosi setup time t setup - mosi 120 ns from data valid to sclk rising edge spi time between write commands t sww 45 ? s from rising sclk for last bit of the first data byte, to rising sclk for last bit of the second data byte. spi time between write and read commands t swr 45 ? s from rising sclk for last bit of the first data byte, to rising sclk for last bit of the second address byte. spi time between read and subsequent commands t srw t srr 2 0 ? s from rising sclk for last bit of the first data byte, to falling sclk for the first bit of the address byte of the next command. spi read address - data delay t srad 35 ? s from rising sclk for last bit of the address byte, to falling sclk for first bit of data being read. pixart confidential
6 pixart imaging inc. pmw3901mb product datasheet optical motion tracking chip version 1.10 | 20 june 2017 pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission. ncs inactive after motion burst t bexit 500 ns minimum ncs inactive time after motion burst before next spi usage ncs to sclk active t ncs - sclk 120 ns from last ncs falling edge to first sclk rising edge sclk to ncs inactive (for read operation) t sclk - ncs 120 ns from last sclk rising edge to ncs rising edge, for valid miso data transfer sclk to ncs inactive (for write operation) t sclk - ncs 35 ? s from last sclk rising edge to ncs rising edge, for valid mosi data transfer ncs to miso high - z t ncs - miso 500 ns from ncs rising edge to miso high - z state motion rise time t r - motion 50 ns c l = 100pf motion fall time t f - motion 50 ns c l = 100pf input capacitance c in 50 pf sclk, mosi, ncs load capacitance c l 100 pf miso, motion transient supply current i ddt 70 ma max supply current durin g the supply ramp from 0v to v dd with min 150 us and max 20 ms rise time (does not include charging currents for bypass capacitors). i ddtio 70 ma max supply current durin g the supply ramp from 0v to v dd io with min 150 us and max 20 ms rise time (does not include charging currents for bypass capacitors). note : all the parameters are tested under operating conditions: v dd = 2.0v, v ddio = 2.0v, t a = 25c. pixart confidential
7 pixart imaging inc. pmw3901mb product datasheet optical motion tracking chip version 1.10 | 20 june 2017 pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission. mechanical specifications 3.1 package marking refer figure 1. pin configuration for the code marking location on the device package. table 6 . code identification code marking description product number p 3901 part number label lot code ywx y: year w: week x: reserved as pixart reference 3.2 package outline drawing caution: it is advised that normal static discharge precautions be taken in handling and assembling of this component to prevent damage and/or degradation which may be induced by esd. figure 2 . package outline drawing pixart confidential
8 pixart imaging inc. pmw3901mb product datasheet optical motion tracking chip version 1.10 | 20 june 2017 pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission. 3.3 assembly drawings figure 3 . system assembly view figure 4 . exploded view of system assembly pixart confidential
9 pixart imaging inc. pmw3901mb product datasheet optical motion tracking chip version 1.10 | 20 june 2017 pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission. note: bottom center pad of cob package must be connected to circuit ground. figure 5 . recommended pcb layout figure 6 . lens outline drawing pixart confidential
10 pixart imaging inc. pmw3901mb product datasheet optical motion tracking chip version 1.10 | 20 june 2017 pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission. system level description 4.1 reference schematic figure 7 . pmw3901mb reference schematics pmw3901mb 1 2 3 4 5 6 7 21 20 19 18 17 16 15 8 9 10 11 12 13 14 28 27 26 25 24 23 22 motion nreset sclk led_n gnd vdd vddio vreg nc nc nc nc nc nc nc nc miso ncs gnd nc c1 22uf note: 1. all capacitors must be placed as close as possible to vdd, vddio & vreg pins. 2. ceramic non-polarity capacitors are recommended. 29 * gnd pad 1 2 3 9 sclk miso motion vdd gnd r2 10k mcu 4 8 mosi vddio ncs 7 vddio r3 10k 6 nc nc nc nc nc nc nc mosi vdd c2 22uf c3 100nf r1 3 vddio c4 10uf c5 100nf c6 4.7uf c7 100nf 5 nreset r4 10k pixart confidential
11 pixart imaging inc. pmw3901mb product datasheet optical motion tracking chip version 1.10 | 20 june 2017 pixart imaging inc. http://www.pixart.com all rights reserved. any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission. registers 5.1 registers list pmw3901mb registers are accessible via the serial port. the registers are used to read motion data and status as well as to set the device configuration. table 7 . register list address register name access reset address register name access reset 0x00 product_ id ro 0x49 0x0a minimum_rawdata ro 0x00 0x01 revision_id ro 0x00 0x0b shutter_lower ro 0x00 0x02 motion r/w 0x00 0x0c shutter_upper ro 0x00 0x03 delta_x_l ro 0x00 0x15 observation r/w 0x00 0x04 delta_x_h ro 0x00 0x16 motion_burst ro 0x00 0x05 delta_y_l ro 0x00 0x3a power_up_reset wo n/a 0x06 delta_y_h ro 0x00 0x3b shutdown wo n/a 0x07 squal ro 0x00 0x58 rawdata_grab r/w 0x00 0x08 rawdata_sum ro 0x00 0x59 rawdata_grab_status ro 0x00 0x09 maximum_rawdata ro 0x00 0x5f inverse_product_id ro 0xb6 pixart confidential

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