ADT7421ARMZ-RL7 ON Semiconductor, ADT7421ARMZ-RL7 Datasheet - Page 17

• Manufacturer Part Number: ADT7421ARMZ-RL7
• Description: IC TEMP MONITOR 8-MSOP
• Manufacturer: ON Semiconductor
• Type: Temperature Sensorr

Specifications of ADT7421ARMZ-RL7

• Input Type: Logic
• Output Type: Logic
• Interface: 2-Wire SMBus
• Current - Supply: 4mA
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Full Temp Accuracy: +/- 2.75 C, +/- 3.25 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 11. Configuration Register; Read Address 0x03, Write Address 0x09
Table 12. Conversion Rate Register (Read Address = 0x04, Write Address = 0x0A)
Table 13. Status Register; (Read Address = 0x02)
1. These flags stay high until the status register is read, or they are reset by POR
<3:0>
Bit
Bit
Bit
7
6
5
4
3
2
1
0
7
6
5
4
7
6
5
4
3
2
1
0
Mask
Run/STOP
ALERT/THERM2
BETA Enable
Reserved
Temperature
Range Select
Reserved
Reserved
BUSY
LHIGH (Note 1)
LLOW (Note 1)
RHIGH (Note 1)
RLOW (Note 1)
D OPEN (Note 1)
RTHRM
LTHRM
Code
0x0A
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
Mnemonic
Name
Conversion rates
Mnemonic
Reserved
Reserved
Reserved
Reserved
Read/Write
Read only
Read only
Read only
1 when ADC converting
1 when local high temperature limit tripped
1 when local low temperature limit tripped
1 when Remote 1 high temperature limit tripped
1 when Remote 1 low temperature limit tripped
1 when Remote 1 sensor open circuit
1 when Remote 1 THERM limit is tripped
1 when local THERM limit is tripped
R/W
R/W
R/W
R/W
R/W
Conversions/Sec
0000 = 0.0625
0001 = 0.125
0010 = 0.25
0011 = 0.5
0100 = 1
0101 = 2
0110 = 4 = default
0111 = 5
1000 = 10
1001 = 20
1010 = 36
Function
Reserved
Reserved
Reserved
Reserved
These bits set how often the ADT7421 measures each temperature
channel.
Setting this Bit to 1 masks all ALERTs on the ALERT pin. Default = 0 = ALERT
enabled. This applies only if Pin 8 is configured as ALERT, otherwise it has no effect.
Setting this Bit to 1 places the ADT7421 in standby mode (that is, it suspends all
temperature measurements (ADC). The SMBus remains active and values can be
written to and read from the registers. THERM and ALERT are also active in standby
mode. Changes made to the limit registers in standby mode that effect the THERM or
ALERT outputs cause these signals to be updated. Default = 0 = temperature
monitoring enabled.
This Bit selects the function of Pin 8. Default = 0 = ALERT. Setting this Bit to 1
configures Pin 8 as THERM2 pin.
Setting this Bit to 0 enables Beta Cancellation. Setting it to 1 disables Beta
Cancellation.
Reserved
Setting this Bit to 1 enables the extended temperature measurement range
(−50°C to +150°C). Default = 0 = (0°C to +127°C).
Reserved
Reserved
http://onsemi.com
17
Function
Description
Time (seconds)
16
8
4
2
1
500 m
250 m
200 m
100 m
50 m
27 m
ALERT
Yes
Yes
Yes
Yes
Yes
No
No
No