CS1112 Datasheet, PDF (8/12 Pages) ON Semiconductor – Quad Power Output Driver

CS1112
Serial clock frequencies up to 4.0 MHz can be used by the
CS1112.
Internal pull–up circuitry is provided on the Chip Select
Bar (CSB) pin. Internal active pulldowns are provided on the
parallel input pins (IN0, IN1, IN2, IN3, and SI pin).
A product highlight of this part is its ability to be
daisy–chained with other parts which follow the SPI
protocol as defined in Figure 1. Figure 4 displays this aspect.
The serial output of each device is fed into the serial input
of the next device. All data bits are clocked into their
respective registers, while the CSB pin is low. The drivers
are switched to the resulting command when the CSB pin is
brought back high.
µP
CSB SCLK
CSB SCLK
CSB SCLK
CS1112
Any IC using
SPI protocol
Any IC using
SPI protocol
SI
SO
SI
SO
SI
SO
1 output with the SPI port, and 3 outputs being controlled
with the parallel inputs allowing them to run in a PWM
mode.
SPI Controlled Outputs
V_BAT
Z0 Z1 Z2 Z3
OUT0
OUT1
OUT2
µP
OUT3
CSB
SCLK
SI
SPI Port
Figure 6.
Figure 4.
Multiple SPI port devices can also be connected in a
parallel fashion (Figure 5) instead of the daisy–chained
connection previously shown. The microprocessor controls
the CS1112 in a multiplex fashion allowing the serial data
input to be input to the device when the device is activated
through the CSB pin. This creates a system whose number
of outputs is a multiple of 4. Figure 5 displays a 12 output
setup.
CS1112
SI
OUT0
SCLK OUT1
µP
CSB _OUT2
OUT3
CS1112
SI
SCLK
CSB
OUT0
OUT1
OUT2
OUT3
CS1112
SI
SCLK
CSB
OUT0
OUT1
OUT2
OUT3
Figure 5.
Figure 6 displays the device controlling 4 outputs with the
use of its SPI port. Figure 7 displays the device controlling
Parallel Controlled Outputs
V_BAT
Parallel Inputs
µP
Control
Z0 Z1 Z2
ÎÎÎÎ _IN0
ÎÎÎÎ _IN1
IN2
ÎÎÎÎÎÎÎÎ _CSB
ÎÎÎÎ SCLK
ÎÎÎÎÎÎÎÎ ^SI
OUT0
OUT1
OUT2
OUT3
SPI Port
SPI Controlled
Outputs
Z3
Figure 7.
The CS1112 provides a very efficient way of controlling
4 output drivers by minimizing the number of I/O pins
through use of the SPI port, and still provides the flexibility
of pulse width modulating the output drivers where needed.
The use of the SPI also allows the integrated circuit to
communicate directly with the microprocessor.
While designed for an automotive environment, the
CS1112 can be used in other applications in the computer
market, industrial market, telecommunications market, or
any other instance where numerous drivers are needed. All
parts are 100% tested and guaranteed to meet all parameters
specified in the electrical characteristics. These
specifications cover the entire voltage range for V_PWR
(9.0 V to 17 V), and V_DD (4.5 V to 5.5 V).
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