tc7129 Microchip Technology Inc., tc7129 Datasheet - Page 14

• Manufacturer Part Number: tc7129
• Description: 4-1/2 Digit Analog-to-digital Converters With On-chip Lcd Drivers
• Manufacturer: Microchip Technology Inc.

Figure 4-11:
Figure 4-12:
DS21459D-page 14
TC7129
Continuity
Common
IN LO
IN HI
INT
RANGE
–
DGND
CONT
INT
1
OSC1
OSC2
OSC3
200 mV
, INT
L/H
V
V–
V+
1
TC7129 Functional Block Diagram.
Integrator Block Diagram.
REF HI
+
2
DE-
DE+
DE
TC7129
C
–
+
REF
Continuity
Comparator
COMMON
INT
DE
REF LO
DE–
DE+
500 k
REST
Sequence Counter/Decoder
Up/Down Results Counter
IN
HI
–
+
Analog Section
Control Logic
LO
ZI, X10
IN
Latch, Decode Display Multiplexer
Segment Drives
Buffer
Low Battery
R
INT
TC7129
Integrator
–
+
C
Continuity
INT
BUFF
Backplane
100 pF
Drives
10
pF
To Display Driver
X10
Comparator 1
Annunciator
Drive
+
–
© 2006 Microchip Technology Inc.
V
DP
DP
UR/DP
OR/DP
REF HI
REF LO
INT OUT
INT IN
DISP
1
2
3
4
Comparator 2
To Digital
Section