tc835 Microchip Technology Inc., tc835 Datasheet - Page 5

• Manufacturer Part Number: tc835
• Description: Personal Computer Data Acquisition A/d Converter
• Manufacturer: Microchip Technology Inc.

2.0
The descriptions of the pins are listed in
TABLE 2-1:
© 2007 Microchip Technology Inc.
Pin Number
28-Pin PDIP
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
4
5
6
7
8
9
PIN DESCRIPTIONS
ANALOG COMMON
PIN FUNCTION TABLE
UNDERRANGE
OVERRANGE
RUN/HOLD
BUFF OUT
POLARITY
CLOCK IN
STROBE
INT OUT
Symbol
+INPUT
REF IN
-INPUT
C
DGND
C
BUSY
AZ IN
REF
REF
V+
D5
B1
B2
B4
B8
D4
D3
D2
D1
V-
+
-
Negative power supply input.
External reference input.
Reference point for REF IN.
Integrator output. Integrator capacitor connection.
Auto zero input. Auto zero capacitor connection.
Analog input buffer output. Integrator resistor connection.
Reference capacitor input. Reference capacitor negative connection.
Reference capacitor input. Reference capacitor positive connection.
Analog input. Analog input negative connection.
Analog input. Analog input positive connection.
Positive power supply input.
Digit drive output. Most Significant Digit (MSD)
Binary Coded Decimal (BCD) output. Least Significant Bit (LSB)
BCD output.
BCD output.
BCD output. Most Significant Bit (MSB)
Digit drive output.
Digit drive output.
Digit drive output.
Digit drive output. Least Significant Digit (LSD)
Busy output. At the beginning of the signal-integration phase, BUSY goes High and
remains High until the first clock pulse after the integrator zero crossing.
Clock input. Conversion clock connection.
Polarity output. A positive input is indicated by a logic High output. The polarity output is
valid at the beginning of the reference integrate phase and remains valid until determined
during the next conversion.
Digital logic reference input.
Run / Hold input. When at a logic High, conversions are performed continuously. A logic
Low holds the current data as long as the Low condition exists.
Strobe output. The STROBE output pulses low in the center of the digit drive outputs.
Over range output. A logic High indicates that the analog input exceeds the full scale input
range.
Under range output. A logic High indicates that the analog input is less than 9% of the full
scale input range.
Table
2-1.
Description
DS21478C-page 5
TC835