mc33742 Freescale Semiconductor, Inc, mc33742 Datasheet - Page 4

• Manufacturer Part Number: mc33742
• Description: Mc33742 System Basis Chip Sbc With Enhanced High-speed Can Transceiver
• Manufacturer: Freescale Semiconductor, Inc

Table 2. 33742 28-Pin Definitions
4
33742
PIN CONNECTIONS
20 – 23
14 –17
A functional description of each pin can be found in the
6 – 9
Pin
10
11
12
13
18
19
24
25
26
27
28
1
2
3
4
5
Pin Name
V2CTRL
WDOG
VSUP
CANH
L0- L3
CANL
SCLK
MISO
MOSI
RXD
VDD
GND
TXD
RST
INT
HS
V2
CS
Voltage Source 2 Control
Voltage Digital Drain
Master In Slave Out
Master Out Slave In
CAN High Output
Serial Data Clock
Watchdog Output
Voltage Source 2
High-Side Output
CAN Low Output
Level 0 - 3 Inputs
Interrupt Output
Voltage Supply
Transmit Data
Formal Name
Receive Data
Reset Output
(Active LOW)
(Active LOW)
(Active LOW)
(Active LOW)
Chip Select
Ground
Figure 3. 33742 28-Pin Connections
V2CTRL
VSUP
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 33742-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 33742.
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 33742. When CS is HIGH, the pin is in the high-
impedance state.
SPI data received by the 33742.
The CS input pin is used with the SPI bus to select the 33742. When the CS is asserted
LOW, the 33742 is the selected device of the SPI bus.
The WDOG output pin is asserted LOW if the software watchdog is not correctly
triggered.
GND
GND
GND
GND
PIN CONNECTIONS
RXD
VDD
TXD
RST
INT
HS
V2
L0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Functional Pin description
28
27
26
25
24
23
22
21
20
19
18
17
16
15
WDOG
CS
MOSI
MISO
SCLK
GND
GND
GND
GND
CANL
CANH
L3
L2
L1
Definition
section beginning on page 22.
Analog Integrated Circuit Device Data
Freescale Semiconductor