1 occupancy classification ic customer benefits: excellent system know-how smart concepts for system safety secured supply long- term availability of manufacturing processes and products qs9000 and iso/ts16949 certified today, bosch automotive electronics introduces a completely new ic supporting occupant detection and classification in automobiles. this highly integrated ic enables system designers to interface between seat mats and microcontroller based system control with a single chip. the CG642B integrates 25 independent measurement channels for seat mat resistor matrix evaluation by utilizing leading-edge automotive asic processes. the superior performance with respect to precision and reliability of th is process will be combined with a variety of features like on-chip power supply and system supervision as requir ed by today?s compatible systems. measurement and diagnosis ic for oc systems with seat mats system supply: 5v regulator with reset and power-on delay window watchdog 23 i/os for precise resistor measurement with low current capability 2 i/os for precise resistor measurement with high current capability seat matrix overvoltage detection and circuit protection measurement matrix for selection of rows and columns 2 analog outputs for current and voltage measurement results iso diagnosis interfaces for baud rates up to 50kbaud all functions controlled via 8 bit bi-directional spi, 4 mhz plcc44 package pin configuration automotive electronics 1 6 CG642B (plcc44 package) 7 17 18 28 29 39 40 44 automotive electronics product information occupancy classification ic - CG642B
2 pin description no name description 1 c9 v-force/i-measure c9 2 c10 v-force/i-measure c10 3 c11 v-force/i-measure c11 4 c12 v-force/i-measure c12 5 cos v-force/i-measure security column 6 eclk clock input (4mhz) 7 vms supply voltage v/c - sense 8 vzp battery supply 9 gvr driver output external regulator 10 rc internal oscillator adjust 11 vst 5.0v regulator output 12 /irs impulse reset (low active) 13 wds watchdog trigger 14 gnd ground 15 /cs chip select (low active) 16 chp charge pump capacitor 17 k diagnosis driver output 18 t1 v-force/i-measure t1 19 t2 v-force/i-measure t2 20 ros v-force/i-measure security row 21 r9 v-force/i-measure r9 22 r8 v-force/i-measure r8 23 r7 v-force/i-measure r7 24 r6 v-force/i-measure r6 25 rxd diagnosis receiver output 26 txd diagnosis driver input 27 sck spi clock 28 mosi master out slave in 29 r5 v-force/i-measure r5 30 r4 v-force/i-measure r4 31 r3 v-force/i-measure r3 32 r2 v-force/i-measure r2 33 r1 v-force/i-measure r1 34 c1 v-force/i-measure c1 35 c2 v-force/i-measure c2 36 c3 v-force/i-measure c3 37 c4 v-force/i-measure c4 38 c5 v-force/i-measure c5 39 c6 v-force/i-measure c6 40 im output current value 41 vm output voltage value 42 miso master in slave out 43 c7 v-force/i-measure c7 44 c8 v-force/i-measure c8 voltage range the CG642B features direct battery supply ranged from 6.0v to 16.5v at pin vzp. a reverse diode for internal protection is recommended. reset the reset signal is generated CG642B internally. pin/irs is an open collector output driven by the internal reset signal. reset is activated during power-on, under voltage and over voltage conditions and watchdog errors. power-on delay takes 34ms after supply ramp-up guaranteeing stable system supply and internal timing consistency. measurement timing a seat resistance measurement can be started by spi command. all timings are controlled CG642B internally. a single seat resistance measurement takes less than 1ms allowing a sample rate of 1 khz. measurement range the CG642B features different measurement ranges for resistor measurement between 1k ? and 500k ? . the appropriate measurement range is selected automatically during active measurement. measurement precision: voltage measurement (pin vm) is performed with a precision of typ. 1% (max 2%), current measurement (pin im) of typ. 5% (max . 20%, depending on the selected measurement range). contact robert bosch gmbh sales semiconductors postbox 13 42 72703 reutlingen germany tel.: +49 7121 35-2979 fax: +49 7121 35-2170 robert bosch corporation component sales 38000 hills tech drive farmington hills, mi 48331 usa tel.: +1 248 876-7441 fax: +1 248 848-2818 robert bosch k.k. component sales 9-1, ushikubo 3-chome tsuzuki-ku, yokohama 224 japan tel.: +81 45 9 12-83 01 fax: +81 45 9 12-95 73 e-mail: bosch.semiconductors@de.bosch.com internet: www.bosch-semiconductors.de ? 02/2006 all rights reserved by robert bosch gmbh includin g the right to file industrial property rights robert bosch gmbh retains the sole powers of distribution, such as re production, copying and distribution. for any use of products outside the released application, specif ied environments or installation conditions no warranty shall a pply and bosch shall not be liable for such products or any damage caused by such products.
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