AD7992BRMZ-0REEL (Analog) PDF资料下载 Datasheet(11/29 页)

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型号：	AD7992BRMZ-0REEL
厂商：	Analog Devices Inc
文件页数：	11/29页
文件大小：	0K
描述：	IC ADC 12BIT 2CHAN I2C 10MSOP
标准包装：	3,000
位数：	12
采样率（每秒）：	79k
数据接口：	I²C，串行
转换器数目：	1
功率耗散（最大）：	2.2mW
电压电源：	单电源
工作温度：	-40°C ~ 125°C
安装类型：	表面贴装
封装/外壳：	10-TFSOP，10-MSOP（0.118"，3.00mm 宽）
供应商设备封装：	10-MSOP
包装：	带卷 (TR)
输入数目和类型：	2 个单端，单极

AD7992

Rev. 0 | Page 18 of 28

CONVERSION RESULT REGISTER

The conversion result register is a 16-bit, read-only register that

stores the conversion result from the ADC in straight binary

format. A 2-byte read is needed to read data from this register.

Table 12 shows the contents of the first byte to be read from the

AD7992, and Table 13 shows the contents of the second byte.

Table 12. Conversion Value Register (First Read)

D15

D14

D13

D12

D11

D10

Alert_Flag

Zero

CHID0

MSB

B10

Table 13. Conversion Value Register (Second Read)

The AD7992 conversion result consists of an Alert_Flag bit, two

leading zeros, a channel identifier bit, and the 12-bit data result.

The Alert_Flag bit indicates whether the conversion result

being read or any other channel result has violated the limit

registers associated with it. If an ALERT occurs, the master may

wish to read the ALERT status register to obtain more informa-

tion on where the ALERT occurred if the Alert_Flag bit is set.

The Alert_Flag bit is followed by two leading zeros and a

channel identifier bit that indicate to which channel the con-

version result corresponds. When this bit is 0, the conversion

result corresponds to VIN1, and when it is 1, the conversion

result corresponds to VIN2. These, in turn, are followed by the

12-bit conversion result, MSB first.

LIMIT REGISTERS

The AD7992 has two pairs of limit registers. Each pair stores

high and low conversion limits for both analog input channels.

Each pair of limit registers has one associated hysteresis register.

All 6 registers are 16 bits wide; only the 12 LSBs of the registers

are used. On power-up, the contents of the DATAHIGH register

for each channel are full scale, while the contents of the

DATALOW registers are zero scale by default.

The limit registers can be used to monitor the conversion

results on one or both channels. The AD7992 signals an

ALERT (in either hardware or software or both, depending

on the configuration) if the result moves outside the upper or

lower limit set by the user.

DATAHIGH Register CH1/CH2

The DATAHIGH register for a channel is a 16-bit, read/write

stores the upper limit that activates the ALERT output and/or

the Alert_Flag bit in the conversion result register. If the value

in the conversion result register is greater than the value in the

DATAHIGH register, an ALERT occurs. When the conversion

result returns to a value at least N LSB below the DATAHIGH

reset. The value of N is taken from the 12-bit hysteresis register

associated with that channel. The ALERT pin can also be reset

by writing to Bits D2 and D1 in the configuration register.

Table 14. AD7992 DATAHIGH Register (First Read/Write)

D15

D14

D13

D12

D11

D10

B11

B10

Table 15. AD7992 DATAHIGH Register (Second Read/Write)

DATALOW Register CH1/CH2

The DATALOW register for each channel is a 16-bit read/write

stores the lower limit that activates the ALERT output and/or

the Alert_Flag bit in the conversion result register. If the value

in the conversion result register is less than the value in the

DATALOW register, an ALERT occurs. When the conversion

result returns to a value at least N LSB above the DATALOW

reset. The value of N is taken from the hysteresis register

associated with that channel. The ALERT output pin can also be

reset by writing to Bits D2 and D1 in the configuration register.

Table 16. DATALOW Register (First Read/Write)

D15

D14

D13

D12

D11

D10

B11

B10

Table 17. DATALOW Register (Second Read/Write)

Hysteresis Register (CH1/CH2)

Each hysteresis register is a 16-bit read/write register; only

the 12 LSBs of the register are used. The hysteresis register

stores the hysteresis value, N, when using the limit registers.

Each pair of limit registers has a dedicated hysteresis register.

The hysteresis value determines the reset point for the ALERT

pin/Alert_Flag if a violation of the limits has occurred. For

example, if a hysteresis value of 8 LSB is required on the

upper and lower limits of Channel 1, the 16 bit word,

0000 0000 0000 1000, should be written to the hysteresis

On power-up, the hysteresis registers contain a value of 8 LSB.

If a different hysteresis value is required, that value must be

written to the hysteresis register for the channel in question.

Table 18. Hysteresis Register (First Read/Write)

D15

D14

D13

D12

D11

D10

B11

B10

Table 19. Hysteresis Register (Second Read/Write)

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相关代理商/技术参数	参数描述
AD7992BRMZ-1	功能描述:IC ADC 12BIT 2CHAN I2C 10-MSOP RoHS:是类别:集成电路 (IC) >> 数据采集 - 模数转换器系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字工作温度:-40°C ~ 125°C 安装类型:表面贴装封装/外壳:24-VFQFN 裸露焊盘供应商设备封装:24-VQFN 裸露焊盘（4x4）包装:Digi-Reel® 输入数目和类型:8 个单端，单极产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6
AD7992BRMZ-1-R2	制造商:Analog Devices 功能描述:
AD7992BRMZ-1REEL	功能描述:IC ADC 12BIT 2CHAN I2C 10MSOP RoHS:是类别:集成电路 (IC) >> 数据采集 - 模数转换器系列:- 标准包装:2,500 系列:- 位数:16 采样率（每秒）:15 数据接口:MICROWIRE?，串行，SPI? 转换器数目:1 功率耗散（最大）:480µW 电压电源:单电源工作温度:-40°C ~ 85°C 安装类型:表面贴装封装/外壳:38-WFQFN 裸露焊盘供应商设备封装:38-QFN（5x7）包装:带卷 (TR) 输入数目和类型:16 个单端，双极；8 个差分，双极配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494
AD7993	制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, 12-/10-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP
AD7993-0	制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, 10- and 12-Bit ADCs with I2C Compatible Interface in 16-Lead TSSOP

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