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ADT7421ARMZ-2RL7

Precision Temperature Sensor with Beta Compensation (for <45 nm Geometries)

ON Semiconductor 

ADT7421

Table 11. Configuration Register; Read Address 0x03, Write Address 0x09

Bit

Mnemonic

Read/Write

Description

7

Mask

R/W

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.

6

Run/STOP

R/W

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.

5

ALERT/THERM2

R/W

This Bit selects the function of Pin 8. Default = 0 = ALERT. Setting this Bit to 1

configures Pin 8 as THERM2 pin.

4

BETA Enable

R/W

Setting this Bit to 0 enables Beta Cancellation. Setting it to 1 disables Beta

Cancellation.

3

Reserved

Read only Reserved

2

Temperature

Range Select

R/W

Setting this Bit to 1 enables the extended temperature measurement range

(−50°C to +150°C). Default = 0 = (0°C to +127°C).

1

Reserved

Read only Reserved

0

Reserved

Read only Reserved

Table 12. Conversion Rate Register (Read Address = 0x04, Write Address = 0x0A)

Bit

Code

Mnemonic

Function

7

Reserved

Reserved

6

Reserved

Reserved

5

Reserved

Reserved

4

Reserved

Reserved

<3:0>

Conversion rates These bits set how often the ADT7421 measures each temperature

channel.

0x00

0x01

0x02

0x03

0x04

0x05

0x06

0x07

0x08

0x09

0x0A

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

Time (seconds)

16

8

4

2

1

500 m

250 m

200 m

100 m

50 m

27 m

Table 13. Status Register; (Read Address = 0x02)

Bit

Name

Function

7

BUSY

1 when ADC converting

6

LHIGH (Note 1)

1 when local high temperature limit tripped

5

LLOW (Note 1)

1 when local low temperature limit tripped

4

RHIGH (Note 1)

1 when Remote 1 high temperature limit tripped

3

RLOW (Note 1)

1 when Remote 1 low temperature limit tripped

2

D OPEN (Note 1)

1 when Remote 1 sensor open circuit

1

RTHRM

1 when Remote 1 THERM limit is tripped

0

LTHRM

1 when local THERM limit is tripped

1. These flags stay high until the status register is read, or they are reset by POR

ALERT

No

Yes

Yes

Yes

Yes

Yes

No

No

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