33888 Datasheet, PDF (5/40 Pages) Freescale Semiconductor, Inc – Quad High-Side and Octal Low-Side Switch for Automotive

PIN CONNECTIONS
Table 2. 33888 Pin Definitions for PQFN (continued)
A functional description of each pin can be found in the Functional Pin Description section beginning on page 18.
Pin Number Pin Name Pin Function Formal Name
Definition
13
VDD
Input
Digital Drain Voltage ^{This is an external input pin used to supply power to the SPI circuit.}
(Power)
14
SO
Output
Serial Output
This is an output pin connected to the SPI Serial Data Input pin of the
MCU or to the SI pin of the next device in a daisy chain.
16
CS
Input
Chip Select
This is an input pin connected to a chip select output of a microcontroller
(Active Low)
(MCU).
17
SCLK
Input
Serial Clock
This input pin is connected to the SCLK pin of the master MCU, which is
a bit (shift) clock for the SPI port.
18
SI
Input
Serial Input
This input pin is connected to the SPI Serial Data Output pin of the MCU
from which it receives output command data.
19
ILS
Input
Low-Side Input
This input pin is used to directly control a number of the low-side devices
as configured by SPI.
21
IHS3
Input
High-Side Input 3 ^{These inputs may or may not be activated depending on the configured}
22
IHS2
High-Side Input 2 state of the internal logic.
30
IHS0
High-Side Input 0
31
IHS1
High-Side Input 1
23
CSNS2 - 3
Output
Current Sense 2-3 These pins deliver a metered amount of the high-side output current that
29
CSNS0 - 1
Current Sense 0-1 can be used to generate signal ground referenced output voltages for use
by the MCU.
25
HS3
Output
High-Side Output 3 ^{Each pin is the source of a 40 mΩ MOSFET high-side driver, which}
28
HS2
High-Side Output 2 delivers current through the connected loads.
26
HS1
Output
High-Side Output 1 ^{Each pin is the source of a 10 mΩ MOSFET high-side driver, which}
27
HS0
High-Side Output 0 ^{delivers current through the connected loads.}
33
WAKE
Input
Wake
This pin is used to input a logic [1] signal in order to enable the watchdog
timer function.
34
RST
Input
Reset (Active Low) ^{This input pin is used to initialize the device configuration and fault}
registers, as well as place the device in a low current standby mode.
35
FSI
Input
Fail-Safe Input
The Fail-Safe input pin level determines the state of the outputs after a
watchdog timeout occurs. This pin has an internal pullup.
36
WDIN
Input
Watchdog Input This input pin is a CMOS logic level input that is used to monitor system
operation.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33888
5