mc33794 Freescale Semiconductor, Inc, mc33794 Datasheet - Page 2

• Manufacturer Part Number: mc33794
• Description: Electric Field Imaging Device
• Manufacturer: Freescale Semiconductor, Inc

2
MC33794
* REF_A and REF_B are
not switched to ground
when not selected.
GND and HEAT SINK
REF_A*, REF_B*
LAMP_CTRL
LAMP_GND
PWR_MON
V
ISO_OUT
DD
A,B,C,D
ISO_IN
WD_IN
E1–E9
AGND
_
TEST
V
MON
RST
PWR
V
V
DD
CC
2.8 k
2.8 k
Figure 1. Simplified Functional Block Diagram
Ω
Ω
INTERNAL BLOCK DIAGRAM
(Note: All Resistor Values are Nominal)
4
REG
REG
POR/
V
V
WD
CC
DD
MUX
OUT
MUX
IN
CONTROL
LOGIC
22 k
Ω
(Nominal)
ATTN
LAMP CKT
ISO-9141
OSC
GAIN AND
OFFSET
RECT
LPF
150
300
Ω
Ω
Freescale Semiconductor
CLK
R_OSC
SHIELD_EN
SHIELD
LEVEL
SIGNAL
LAMP_MON
LAMP_OUT
LP_CAP
LAMP_SENSE
ISO-9141
39 k
10 nF
Ω
Sensors