Datasheet
Table Of Contents
- 1.0 Electrical characteristics
- 2.0 Pin Descriptions
- 3.0 Detailed Description
- 4.0 Typical Applications
- 4.1 TC7129 as a Replacement Part
- 4.2 Powering the TC7129
- 4.3 Connecting to External Logic
- 4.4 Temperature Compensation
- 4.5 RC Oscillator
- 4.6 Measuring Techniques
- 4.7 Dual-Slope Conversion
- 4.8 Successive Integration
- 4.9 Digital Auto-Zeroing
- 4.10 Inside the TC7129
- 4.11 Integrator Section
- 4.12 Continuity Indicator
- 4.13 Common and Digital Ground
- 4.14 Low Battery
- 4.15 Sequence and Results Counter
- 4.16 Overrange and Underrange Outputs
- 4.17 LATCH/Hold
- 4.18 Display Driver
- 5.0 Packaging Information
- 6.0 Revision History
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TC7129
DS21459E-page 14 2002-2012 Microchip Technology Inc.
Figure 4-11: TC7129 Functional Block Diagram.
Figure 4-12: Integrator Block Diagram.
Low Battery Continuity
Segment Drives
Backplane
Drives
Latch, Decode Display Multiplexer
Up/Down Results Counter
Sequence Counter/Decoder
Control Logic
Analog Section
OSC1
OSC2
OSC3
RANGE
L/H
CONT
V+
V–
DGND
COMMON IN
HI
IN
LO
BUFF
DP
1
DP
2
UR/DP
3
OR/DP
4
REF HI
REF LO
INT OUT
INT IN
Annunciator
Drive
V
DISP
TC7129
Common
REF HI
Buffer
Integrator
DE
ZI, X10
Comparator 1
200 mV
C
REF
R
INT
C
INT
INT
1
IN HI
+
–
–
+
–
+
REF LO
DE
IN LO
–
+
DE- DE+
DE+
DE–
100 pF
V
–
+
Continuity
INT
1
,
INT
2
Continuity
Comparator
500 k
Ω
REST
To Display Driver
10
pF
Comparator 2
To Digital
Section
TC7129
INT
X10