33742_08 Datasheet, PDF (57/70 Pages) Freescale Semiconductor, Inc – System Basis Chip with Enhanced High Speed CAN Transceiver

TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
SBC POWER SUPPLY
The 33742 is supplied from the battery line. A serial diode is necessary to protect the device against negative transient pulses
and from reverse battery. This is illustrated in Figure 31.
V_PWR
SW1
Rp
R1
to L1
C6
SW2
Rp
R2
to L1
C7
SW3
R3
Rd
to L2
C8
D1
V_SUP
C1
C2
HS
L0
L1
L2
L3
CANH
CANL
Internal
Module
Supply
33742
VSUP Monitor
Dual Voltage Regulator
VDD Monitor
5.0V/200mA
HS
Control
Mode Control
Oscillator
Programmable
Wake-up Input
Interrupt
Watchdog
Reset
SPI Interface
1.0 Mbps CAN
Physical Interface
Q1
V2
R5
V2CTRL
V2
C10 C5
VDD
C3
INT
WDOG
RST
MOSI
SCLK
MISO
CS
TXD
RXD
GND
C4
MCU
Safe Circuitry
SW4
R4
Rd
Clamp (1)
to L3
C9
Connector
Legend
D1: Example: 1N4002 type
Q1: MJD32C
R1, R2, R3, R4: 10kΩ
Rp, Rd: Example: 1.0kΩ depending on switch type.
R5: 2.2kΩ
C1: 10μF
C2: 100nF
C3: 47μF
C4: 100nF
C5: 47μF tantalum or 100μF chemical
C6, C7, C8, C9, C10: 100nF
(1) Clamp circuit to ensure max ratings for HS (HS from
- 0.3V to V_SUP + 0.3) are respected.
Figure 31. SBC Typical Application Schematic
Analog Integrated Circuit Device Data
Freescale Semiconductor
33742
57