Datasheet > 传感器/换能器 > 温度传感器> ADT7461ARM-REEL

ADT7461ARM-REEL

更新时间： 2024-01-06 14:32:40

品牌	Logo	应用领域
安森美 - ONSEMI		传感器换能器温度传感器光电二极管
页数	文件大小	规格书
20页	277K
描述
Â±1â Temperature Monitor with Series Resistance Cancellation

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技术参数
数据手册

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ADT7461ARM-REEL 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Transferred	零件包装代码：	SOIC
包装说明：	LEAD FREE, MS-012-AA, SOIC-8	针数：	8
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5
模拟集成电路 - 其他类型：	ANALOG CIRCUIT	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e3	长度：	4.9 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	8	最高工作温度：	120 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	1.75 mm
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	3 V
标称供电电压 (Vsup)：	3.3 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3.9 mm	Base Number Matches：	1

ADT7461ARM-REEL 数据手册

ADT7461

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

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).

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.

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.

Table 4. Conversion Rate Register Codes

Code

Conversion/Sec

Average Supply Current

mA Typ at VDD = 5.5 V

Status Register

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

It contains status information for the ADT7461.

0x00

0x01

0.0625

121.33

128.54

131.59

146.15

169.14

233.12

347.42

638.07

252.44

417.58

816.87

0.125

0x02

0.25

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

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

goes high. The user may add hysteresis by programming

temperature falls to limit value minus hysteresis value.

0x03

0.5

0x04

0x05

0x06

0x07

0x08

0x09

0x0A

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

http://onsemi.com

1...7 8 91011 12 13...20

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