CS4122_05 Datasheet, PDF (1/9 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 POWERSENSEt 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 SOIC−24 WB Package
• Pb−Free Packages are Available*
http://onsemi.com
24
1
SOIC−24 WB
DWF SUFFIX
CASE 751E
MARKING DIAGRAM
24
CS4122
AWLYYWWG
1
CS4122
A
WL
YY
WW
G
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
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
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
1
September, 2005 − Rev. 9
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 4 of this data sheet.
Publication Order Number:
CS4122/D