参数资料
型号: AD7294BCPZRL
厂商: Analog Devices Inc
文件页数: 24/49页
文件大小: 0K
描述: IC ADC 12BIT I2C/SRL 1M 56LFCSP
标准包装: 2,500
类型: ADC,DAC
分辨率(位): 12 b
采样率(每秒): 22.22k
数据接口: I²C,串行
电压电源: 模拟和数字
电源电压: 4.4 V ~ 5.5 V
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 56-VFQFN 裸露焊盘,CSP
供应商设备封装: 56-LFCSP-VQ(8x8)
包装: 带卷 (TR)
Data Sheet
AD7294
Rev. H | Page 29 of 48
ADC Channel Allocation
The three channel address bits indicate which channel the result
in the result register represents. Table 13 details the channel ID bits
(S.E. indicates single-ended and DIFF indicates differential).
Table 13. ADC Channel Allocation
Function
Channel ID
CH
ID2
CH
ID1
CH
ID0
V
IN0 (S.E.) or
V
IN0 VIN1 (DIFF)
0
V
IN1 (S.E.) or
V
IN1 VIN0 (DIFF)
0
1
V
IN2 (S.E.) or
V
IN2 VIN3 (DIFF)
0
1
0
V
IN3 (S.E.) or
V
IN3 VIN2 (DIFF)
0
1
I
SENSE1
1
0
I
SENSE2
1
0
1
T
SENSE1
1
0
T
SENSE2
1
TSENSE1, TSENSE2 RESULT REGISTERS (0x02 AND 0x03)
Register TSENSE1 and Register TSENSE2 are 16-bit read only registers.
The MSB, D15 is the alert_flag bit whereas Bit D14 to Bit D12
contain the three ADC channel allocation bits. D11 is reserved
for flagging diode open circuits. The temperature reading from
the ADC is stored in an 11-bit twos complement format, D10 to
D0 (see Table 14 and Table 15). Conversions take place approx-
imately every 5 ms.
Table 14. TSENSE Register (First Read)
MSB
LSB
D15
D14
D13
D12
D11
D10
D9
D8
Alert_Flag
CH
ID2
CH
ID1
CH
ID0
B11
B10
B9
B8
Table 15. Register (Second Read)
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
B7
B6
B5
B4
B3
B2
B1
B0
TSENSEINT RESULT REGISTER (0x04)
The TSENSEINT register is a 16-bit read-only register used to
store the ADC data generated from the internal temperature
sensor. Similar to the TSENSE1 and TSENSE2 result registers, this
register stores the temperature readings from the ADC in an 11-
bit twos complement format, D10 to D0, and uses the MSB as a
general alert flag. Bits[ D14:D11] are not used and are set to
zero. Conversions take place approximately every 5 ms. The
temperature data format in Table 16 also applies to the internal
temperature sensor data.
Temperature Value Format
The temperature reading from the ADC is stored in an 11-bit
twos complement format, D10 to D0, to accommodate both
positive and negative temperature measurements. The temper-
ature data format is provided in Table 16.
Table 16. TSENSE Data Format
Input
D10 (MSB)
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0 (LSB)
Value (°C)
256
+128
+64
+32
+16
+8
+4
+2
+1
+0.5
+0.25
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