HA12187FP

HA12187FP Bus Interface Driver/Receiver IC ADE-207-174A (Z) 2nd Edition Jun. 1999 Description The HA12187FP was developed to be used as a bus interface driver/receiver IC in automotive audio equipment controllers. It implements a two-wire serial bus. Functions Two-input OR circuit Input comparator circuit Current output driver circuit Receiver input comparator circuit Receiver output circuit Standby circuit Features Supports two data inputs (Pins 1 and 3 are the input pins) Comparators with hysteresis characteristics were adopted for the inputs Current drive output drivers adopted (Output current: 3.8 mA typical) Comparators with hysteresis characteristics were adopted for the receivers Wide receiver common-mode input operating range (Common-mode input operating range: 0 to 5 V typical) The driver output and the receiver input can withstand high voltages (Maximum rating: 18 V) Standby function (The IC enters standby mode when pin 8 goes low) Operating power-supply voltage range: 5 V ±0.5 V HA12187FP Block Diagram VCC 7 S1 1 S2 3 + – Driver output (current) 6 BUS (+) 8 BIAS 5 BUS (–) R 2 Receiver output – COM + 4 Rev.2, Jun. 1999, page 2 of 23 HA12187FP Pin Functions Pin No. 1 Symbol S1 Function Data input 1 20 k Equivalent Circuit 2 R out Receiver output SW 2 SW 100 3 S2 Data input 3 20k 4 5 6 GND BUS (–) BUS (+) GND Bus output (–) Receiver input (–) Bus output (+) Receiver input (+) SW Receiver input (+) I 6 VREF Rece...