ADM1021AARQ-REEL ON Semiconductor, ADM1021AARQ-REEL Datasheet - Page 9

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ADM1021AARQ-REEL

Manufacturer Part Number
ADM1021AARQ-REEL
Description
IC SENSOR TEMP DUAL3/5.5V 16QSOP
Manufacturer
ON Semiconductor
Datasheet

Specifications of ADM1021AARQ-REEL

Rohs Status
RoHS non-compliant
Function
Temp Monitoring System (Sensor)
Topology
ADC, Comparator, Multiplexer, Register Bank
Sensor Type
External & Internal
Sensing Temperature
0°C ~ 100°C, External Sensor
Output Type
SMBus™
Output Alarm
Yes
Output Fan
No
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
0°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
16-QSOP
corresponding low temperature limit, then one or more of
these flags are set. Bit 2 is a flag that is set if the remote
temperature sensor is open−circuit. These five flags are
NOR’d together so that if any of them are high, the ALERT
interrupt latch is set and the ALERT output goes low. Reading
the status register clears the five flag bits, provided the error
conditions that caused the flags to be set have gone away.
While a limit comparator is tripped due to a value register
containing an out−of−limit measurement, or the sensor is
open−circuit, the corresponding flag bit cannot be reset. A
flag bit can only be reset if the corresponding value register
contains an in−limit measurement, or the sensor is good.
1. Writing to Address 0F causes the ADM1021A to perform a single measurement. It is not a data register and data written to it is irrelevant.
status register, but is reset when the ALERT output is
serviced by the master reading the device address, provided
the error condition has gone away and the status register flag
bits have been reset.
Configuration Register
which is the power−on default, the device is in operating
mode with the ADC converting. If Bit 6 is set to 1, the device
Table 3. List of ADM1021A Registers
The ALERT interrupt latch is not reset by reading the
Two bits of the configuration register are used. If Bit 6 is 0,
Read Address (Hex)
Not applicable
Not applicable
FE
00
01
02
03
04
05
06
07
08
10
12
13
14
15
17
19
20
FF
11
Write Address (Hex)
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
0F (Note 1)
0C
0D
09
0A
0B
0E
12
13
14
16
18
21
11
Address pointer
Local temperature value
Remote temperature value
Status
Configuration
Conversion rate
Local temperature high limit
Local temperature low limit
Remote temperature high limit
Remote temperature low limit
One−shot
Reserved
Remote temperature offset
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Manufacturer device ID
Die revision code
http://onsemi.com
ADM1021A
9
Name
is in standby mode and the ADC does not convert. Standby
mode can also be selected by taking the STBY pin low. In
standby mode, the values stored in the remote and local
temperature registers remain at the values they were when
the part was placed in standby.
ALERT output. If Bit 7 is 0, which is the power−on default,
the ALERT output is enabled. If Bit 7 is set to 1, the ALERT
output is disabled.
Table 2. Status Register Bit Assignments
*These flags stay high until the status register is read or they are
1 to 0
Bit 7 of the configuration register is used to mask the
reset by POR.
Bit
7
6
5
4
3
2
RHIGH*
LHIGH*
RLOW*
LLOW*
OPEN*
Name
BUSY
1 when ADC converting
1 when local high temp limit tripped
1 when local low temp limit tripped
1 when remote high temp limit tripped
1 when remote low temp limit tripped
1 when remote sensor open−circuit
Reserved
Undefined
1000 0000 (0x80) (−128°C)
1000 0000 (0x80) (−128°C)
Undefined
0000 0000 (0x00)
0000 0010 (0x02)
0111 1111 (0x7F) (+127°C)
1100 1001 (0xC9) (−55°C)
0111 1111 (0x7F) (+127°C)
1100 1001 (0xC9) (−55°C)
Reserved for future versions
0000 0000 (0°C)
Reserved for future versions
Reserved for future versions
Reserved for future versions
Reserved for future versions
Reserved for future versions
Reserved for future versions
Reserved for future versions
0100 0001 (0x41)
0011 xxxx (0x3x)
Power−On Default
Function

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