ADT7461ARMZ-R7 datasheet(10/20 Pages) ONSEMI

Part #	ADT7461ARMZ-R7

Description	짹1??Temperature Monitor with Series Resistance Cancellation

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ADT7461

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internal oscillator clock by 1, 2, 4, 8, 16, 32, 64, 128, 256,

512, or 1024 to give conversion times from 15.5 ms (Code

0x0A) to 16 seconds (Code 0x00). For example, a

conversion rate of 8 conversions per second means that

beginning at 125 ms intervals; the device performs a

conversion on the internal and external temperature

channels.

This register can be written to and read back over the

SMBus. The higher four bits of this register are unused and

must be set to 0. The default value of this register is 0x08,

giving a rate of 16 conversions per second. Use of slower

conversion times greatly reduces the device power

consumption, as shown in Table 4.

Table 4. Conversion Rate Register Codes

Code

Conversion/Sec

Average Supply Current

mA Typ at VDD = 5.5 V

0x00

0.0625

121.33

0x01

0.125

128.54

0x02

0.25

131.59

0x03

0.5

146.15

0x04

1

169.14

0x05

2

233.12

0x06

4

347.42

0x07

8

638.07

0x08

16

252.44

0x09

32

417.58

0x0A

64

816.87

0x0B to 0xFF

Reserved

Limit Registers

The ADT7461 has eight limit registers: high, low, and

THERM temperature limits for both local and remote

temperature measurements. The remote temperature high

and low limits span two registers each to contain an upper

and lower byte for each limit. There is also a THERM

hysteresis register. All limit registers can be written to and

read back over the SMBus. See Table 8 for address details

of the limit registers and their power-on default values.

When Pin 6 is configured as an ALERT output, the high

limit registers perform a > comparison while the low limit

registers perform a

≤ comparison. For example, if the high

limit register is programmed with 80

°C, then measuring

81

°C results in an out-of-limit condition, setting a flag in the

status register. If the low limit register is programmed with

0

°C, measuring 0°C or lower results in an out-of-limit

condition.

Exceeding either the local or remote THERM limit asserts

THERM low. When Pin 6 is configured as THERM2,

exceeding either the local or remote high limit asserts

THERM2 low. A default hysteresis value of 10

°C is

provided that applies to both THERM channels. This

hysteresis value may be reprogrammed to any value after

powerup (Register Address 0x21).

It is important to remember that the temperature limits

data format is the same as the temperature measurement data

format. So, if the temperature measurement uses default

binary, the temperature limits also use the binary scale. If the

temperature measurement scale is switched, however, the

temperature limits do not switch automatically. The user

must reprogram the limit registers to the desired value in the

correct data format. For example, if the remote low limit is

set at 10

°C and the default binary scale is being used, the

limit register value should be 0000 1010b. If the scale is

switched to offset binary, the value in the low temperature

limit register should be reprogrammed to be 0100 1010b.

Status Register

The status register is a read-only register at Address 0x02.

It contains status information for the ADT7461.

Bit 7 of the status register indicates the ADC is busy

converting when it is high. The other bits in this register flag

the out-of-limit temperature measurements (Bits 6 to 3 and

Bits 1 to 0) and the remote sensor open circuit (Bit 2).

If Pin 6 is configured as an ALERT output, the following

applies. If the local temperature measurement exceeds its

limits, Bit 6 (high limit) or Bit 5 (low limit) of the status

register asserts to flag this condition. If the remote

temperature measurement exceeds its limits, then Bit 4 (high

limit) or Bit 3 (low limit) asserts. Bit 2 asserts to flag an

open-circuit condition on the remote sensor. These five flags

are NOR’d together so if any of them is high, the ALERT

interrupt latch is set and the ALERT output goes low.

Reading the status register clears the five flags, Bits 6 to 2,

provided the error conditions causing the flags to be set have

gone away. A flag bit can be reset only if the corresponding

value register contains an in-limit measurement or if the

sensor is good.

The ALERT interrupt latch is not reset by reading the

status register. It resets when the ALERT output has been

serviced by the master reading the device address, provided

the error condition has gone away and the status register flag

bits are reset.

When Flag 1 and/or Flag 0 are set, the THERM output

goes low to indicate the temperature measurements are

outside the programmed limits. The THERM output does

not need to be reset, unlike the ALERT output. Once the

measurements are within the limits, the corresponding status

register bits are reset automatically and the THERM output

goes high. The user may add hysteresis by programming

Register 0x21. The THERM output is reset only when the

temperature falls to limit value minus hysteresis value.

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