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
Q1
PWR
V2
33742
VSUP Monitor
R5
D1
C1
V2CTRL
V2
V
SUP
C2
Rp
Rp
Dual Voltage Regulator
VDD Monitor
C10 C5
R1
VDD
to L1
C6
5.0 V/200 mA
Mode Control
SW1
C3
HS
Control
C4
Oscillator
HS
INT
Interrupt
Watchdog
Reset
WDOG
RST
L0
L1
L2
L3
Programmable
Wake-Up Input
R2
to L1
MOSI
SCLK
MISO
CS
MCU
SPI Interface
SW2
SW3
C7
CANH
CANL
TXD
RXD
1.0 Mbps CAN
Physical Interface
GND
R3
Internal
Module
Supply
to L2
Rd
Rd
C8
C9
Safe Circuitry
SW4
Clamp (1)
to L3
R4
Connector
Legend
D1: Example: 1N4002 type
Q1: MJD32C
C2: 100 nF
C3: 47 µF
C4: 100 nF
R1, R2, R3, R4: 10 kΩ
C5: 47 µF tantalum or 100 µF chemical
Rp, Rd: Example: 1.0 kΩ depending on switch type.
C6, C7, C8, C9, C10: 100 nF
R5: 2.2 kΩ
C1: 10 µF
(1) Clamp circuit to ensure max ratings for HS (HS from
-0.3 V to VSUP +0.3) are respected.
Figure 31. SBC Typical Application Schematic
33742
Analog Integrated Circuit Device Data
Freescale Semiconductor
52
FREESCALE [ Freescale ]
