CS4122 Datasheet, PDF (1/10 Pages) ON Semiconductor – Triple Air-Core Gauge Driver with Serial Input Bus

CS4122
Triple Air−Core Gauge
Driver with Serial Input Bus
The CS4122 converts digital data from a microprocessor to
complementary DC outputs and drives air−core meter movements for
vehicle instrument panels. It is optimized for one 360° gauge and two
112° gauges. The digital data controls the voltage applied to the
quadrature coils of the meters with a 0.35° resolution for the major
(360°) gauge and 0.44° resolution for the minor (112°) gauges. The
accuracy is ±0.75° for the major and ±1.00° for the minors. The
interface from the microcontroller is by a SPI compatible serial
connection using up to a 2.0 MHz shift clock rate.
The digital code is shifted into the appropriate DAC and
multiplexer. These two blocks provide a tangential conversion
function to change the digital data into the appropriate DC coil
voltage. The major gauge driver can position a pointer anywhere
within a 360° circle while the minor gauge drivers are limited to an arc
of 112.2°.
The output buffers are capable of 70 mA per coil and are protected
against output short circuit conditions. A thermal protection circuit
limits the junction temperature to approximately 160°C.
An open−drain fault output goes low when any of the outputs are
shorted or the device is in a thermal shutdown state. This ASIC is
designed on POWERSENSE™ 3.0.
Features
• Serial Input Bus
• 2.0 MHz Operating Frequency
• Independently Addressable Gauges
• Tangential Drive Algorithm
• 70 mA Drive Circuits
• 0.75° Major Accuracy
• Power−On−Reset
• Protection Features
♦ Short Circuit
♦ Overtemperature
• Internally Fused Leads in SO−24L Package
http://onsemi.com
24
1
SO−24L
DWF SUFFIX
CASE 751E
MARKING
DIAGRAM
24
CS4122
AWLYYWW
1
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
1
SCLK
CS
SIN−
SIN+
GND
GND
GND
GND
V_BB/2
C1+
C1−
V_CC
24
SO
SI
COS+
COS−
GND
GND
GND
GND
C2−
C2+
V_BB
FAULT
ORDERING INFORMATION
Device
Package
Shipping^†
CS4122XDWF24 SO−24L 31 Units/Rail
CS4122XDWFR24 SO−24L 1000 Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2004
1
May, 2004 − Rev. 8
Publication Order Number:
CS4122/D