PIN CONNECTIONS
PIN CONNECTIONS
RX
TX
VDD1
RST
INT
GND
GND
GND
GND
V2
V2CTRL
VSUP
HS1
L0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
WD
CS
MOSI
MISO
SCLK
GND
GND
GND
GND
CANL
CANH
L3
L2
L1
Figure 3. 33989 Pin Connections
Table 1. 33989 Pin Definitions
A functional description of each pin can be found in the Functional Pin Description section beginning on
Pin Number
1
2
3
Pin Name
RX
TX
VDD1
Pin Function
Output
Input
Power
Output
4
5
6–9
20–23
10
11
RST
INT
GND
V2
V2CTRL
Output
Output
Ground
Input
Power
Output
12
13
14–17
22
23
24
25
26
27
28
VSUP
HS1
L0:L3
CANH
CANL
SCLK
MISO
MOSI
CS
WD
Power
Output
Input
Output
Output
Input
Output
Input
Input
Output
Voltage Supply
High Side One
Level 0: 3
CAN High
CAN Low
System Clock
Master In/Slave Out
Master Out/Slave In
Chip Select
Watch Dog
Formal Name
Receive Data
Transmit Data
Voltage Digital Drain
One
Reset
Interrupt
Ground
Voltage Source Two
Voltage Control
Definition
CAN bus receive data output pin.
CAN bus transmit data input pin.
5.0 V regulator output pin. Supply pin for the MCU.
This is the device reset output pin whose main function is to reset the
MCU. This pin has an internal pullup current source to VDD.
This output is asserted LOW when an enabled interrupt condition occurs.
The output is a push-pull structure.
These device ground pins are internally connected to the package lead
frame to provide a 33989-to-PCB thermal path.
Sense input for the V2 regulator using an external series pass transistor.
V2 is also the internal supply for the CAN transceiver.
Output drive source for the V2 regulator connected to the external series
pass transistor.
Supply input pin for the 33989.
Output of the internal high-side switch. The output current is internally
limited to 150 mA.
Inputs from external switches or from logic circuitry.
CAN high output pin.
CAN low output pin.
Clock input pin for the Serial Peripheral Interface (SPI).
SPI data sent to the MCU by the 33989. When CS is HIGH, the pin is in
the high-impedance state.
SPI data received by the 33989.
The CS input pin is used with the SPI bus to select the 33989.
The WD output pin is asserted LOW if the software watchdog is not
correctly triggered.
33989
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
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