ADM1021ARQ PDF VIEW DOWNLOAD, ADM1021ARQ 데이터시트

ADM1021ARQ 데이터 시트보기 (PDF) - Analog Devices

부품명

상세내역

제조사

ADM1021ARQ

Low Cost Microprocessor System Temperature Monitor

Analog Devices

ADM1021ARQ Datasheet PDF : 12 Pages

1 2 3 4 5 6 7 8 9 10 Next Last

ADM1021

The power-on default value of the Address Pointer Register is

00h, so if a read operation is performed immediately after power

on, without first writing to the Address Pointer, the value of the

local temperature will be returned, since its register address is

00h.

Value Registers

The ADM1021 has two registers to store the results of Local

and Remote temperature measurements. These registers are

written to by the ADC and can only be read over the SMBus.

Status Register

Bit 7 of the Status Register indicates that the ADC is busy con-

verting when it is high. Bits 5 to 3 are flags that indicate the

results of the limit comparisons.

If the local and/or remote temperature measurement is above

the corresponding high temperature limit or below the corre-

sponding low temperature limit, then one or more of these flags

will be 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 is high, the ALERT interrupt latch will be set

and the ALERT output will go low. Reading the Status Register

will clear the five flag bits, provided the error conditions that

caused the flags to be set have gone away. While a limit com-

parator 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 corre-

sponding value register contains an in-limit measurement, or the

sensor is good.

The ALERT interrupt latch is not reset by reading the Status

serviced by the master reading the device address, provided the

error condition has gone away and the Status Register flag bits

have been reset.

Table II. Status Register Bit Assignments

Bit Name Function

BUSY

1 When ADC Converting.

LHIGH* 1 When Local High Temp Limit Tripped.

LLOW* 1 When Local Low Temp Limit Tripped.

RHIGH* 1 When Remote High Temp Limit Tripped.

RLOW* 1 When Remote Low Temp Limit Tripped.

OPEN* 1 When Remote Sensor Open-Circuit.

1–0

Reserved.

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

Configuration Register

Two bits of the configuration register are used. If Bit 6 is 0,

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 is in

standby mode and the ADC does not convert. Standby mode

can also be selected by taking the STBY pin low.

Bit 7 of the configuration register is used to mask the 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 III. List of ADM1021 Registers

READ Address (Hex)

WRITE Address (Hex)

Name

Power-On Default

Not Applicable

0F1

Not Applicable

Address Pointer

Local Temp. Value

Remote Temp. Value

Status

Configuration

Conversion Rate

Local Temp. High Limit

Local Temp. Low Limit

Remote Temp. High Limit

Remote Temp. Low Limit

One-Shot

Reserved

Manufacturer Device ID

Die Revision Code

Undefined

0000 0000

Undefined

0000 0000

0000 0010

0111 1111

1100 1001

0111 1111

1100 1001

(00h)

(02h)

(7Fh) (+127°C)

(C9h) (–55°C)

(7Fh) (+127°C)

(C9h) (–55°C)

Undefined2

1000 00002

Undefined2

0000 00002

Undefined

0100 0001 (41h)

Undefined

NOTES

1Writing to address 0F causes the ADM1021 to perform a single measurement. It is not a data register as such and it does not matter what data is written to it.

2These registers are reserved for future versions of the device.

REV. 0

–7–

Share Link: