ADM1021A
ADDRESS POINTER
REGISTER
ONE-SHOT
REGISTER
ON-CHIP
TEMPERATURE
CONVERTION RATE
REGISTER
SENSOR
LOCAL TEMPERATURE
VALUE REGISTER
LOCAL TEMPERATURE
LOW LIMIT COMPARATOR
LOCAL TEMPERATURE
LOW LIMIT REGISTER
D+
D ?
3
4
ANALOG
MUX
A-TO-D
CONVERTER
BUSY
RUN/STANDBY
LOCAL TEMPERATURE
HIGH LIMIT COMPARATOR
REMOTE TEMPERATURE
LOW LIMIT COMPARATOR
LOCAL TEMPERATURE
HIGH LIMIT REGISTER
REMOTE TEMPERATURE
LOW LIMIT REGISTER
REMOTE TEMPERATURE
VALUE REGISTER
REMOTE TEMPERATURE
HIGH LIMIT COMPARATOR
REMOTE TEMPERATURE
HIGH LIMIT REGISTER
CONFIGURATION
REGISTER
15 STBY
EXTERNAL DIODE OPEN-CIRCUIT
STATUS REGISTER
INTERRUPT
MASKING
11 ALERT
ADM1021A
SMBus INTERFACE
1
2
5
7
8
9
13
16
12
14
10
6
NC
V DD
NC
GND
GND
NC
NC
NC
SDATA
SCLK
ADD0
ADD1
NC = NO CONNECT
Figure 1. Functional Block Diagram
Table 1. PIN ASSIGNMENT
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Mnemonic
NC
V DD
D+
D ?
NC
ADD1
GND
GND
NC
ADD0
ALERT
SDATA
NC
SCLK
STBY
NC
Description
No Connect
Positive Supply, 3.0 V to 5.5 V
Positive Connection to Remote Temperature Sensor
Negative Connection to Remote Temperature Sensor
No Connect
Three-state Logic Input, Higher Bit of Device Address
Supply 0 V Connection
Supply 0 V Connection
No Connect
Three-state Logic Input, Lower Bit of Device Address
Open-drain Logic Output Used as Interrupt or SMBus ALERT
Logic Input/Output, SMBus Serial Data. Open-drain Output
No Connect
Logic Input, SMBus Serial Clock
Logic Input Selecting Normal Operation (High) or Standby Mode (Low)
No Connect
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