© Semiconductor Components Industries, LLC, 2001

December, 2001 – Rev. 6

1

Publication Order Number:

CS4192/D

CS4192

Single Air-Core Gauge

Driver

The CS4192 is a monolithic BiCMOS integrated circuit used to

translate a digital 10–bit word from a microprocessor/microcontroller

to complementary DC outputs. The DC outputs drive an air–core

meter commonly used in vehicle instrument panels. The 10 bits of data

are used to linearly control the quadrature coils of the meter directly

with a 0.35

° resolution and ±1.2° accuracy over the full 360° range of

the gauge. The interface from the microcontroller is by a Serial

Peripheral Interface (SPI) compatible serial connection using up to a

2.0 MHz shift clock rate.

The digital code, which is directly proportional to the desired gauge

pointer deflection, is shifted into a DAC and multiplexer. These two

blocks provide a tangential conversion function to change the digital

data into the appropriate DC coil voltage for the angle demanded. The

tangential algorithm creates approximately 40% more torque in the

meter movement than does a sin–cos algorithm at 45

°, 135°, 225°, and

315

° angles. This increased torque reduces the error due to pointer

droop at these critical angles.

Each output buffer is capable of supplying up to 70 mA per coil and

the buffers are controlled by a common OE enable pin. The output

buffers are turned off when OE is brought low, while the logic portion

of the chip remains powered and continues to operate normally. OE

must be high before the falling edge of CS to enable the output buffers.

The status pin (ST) reflects the state of the outputs and is low

whenever the outputs are disabled.

The Serial Gauge Driver is self–protected against fault conditions.

Each driver is protected for 125 mA (typ.) overcurrent while a global

thermal protection circuit limits junction temperature to 170

°C (typ.).

The output drivers are disabled anytime the IC protection circuitry

detects an overcurrent or overtemperature fault. The drivers remain

disabled until a falling edge is presented on CS. If the fault is still

present, the output drivers automatically disable themselves again.

Features

http://onsemi.com

A

= Assembly Location

WL, L

= Wafer Lot

YY, Y

= Year

WW, W

= Work Week

PIN CONNECTION AND

MARKING DIAGRAM

Device

Package

Shipping

ORDERING INFORMATION

CS4192XDWF16

SO–16L

46 Units/Rail

CS4192XDWFR16

SO–16L

1000 Tape & Reel

SO–16L

DWF SUFFIX

CASE 751G

1

16

SCLK

OE

1

16

CS

ST

SI

GND

GND

GND

GND

SO

COS–

SIN+

COS+

SIN–