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参数资料
| 型号： | AD7156BCPZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC CDC 2CH 12BIT 1.8V 10LFCSP |
| 标准包装： | 1 |
| 类型： | 电容数字转换器 |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 100k |
| 数据接口： | 串行 |
| 电压电源： | 单电源 |
| 电源电压： | 1.8 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘，CSP |
| 供应商设备封装： | 10-LFCSP-WD（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 781 (CN2011-ZH PDF) |
| 其它名称： | AD7156BCPZ-REEL7DKR |
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AD7156
Rev. 0 | Page 21 of 28
POWER-DOWN TIMER REGISTER
Address Pointer 0x10
8 Bits, Read/Write, Factory Preset 0x40
Table 14. Power-Down Timer Register Bit Map1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Power-down timeout (6-bit value)
(0)
(1)
(0x00)
1 The default values are given in parentheses.
Table 15.Power-Down Timer Register Bit Descriptions
Bit
Mnemonic
Description
7
This bit must be 0 for proper operation.
6
This bit must be 1 for proper operation.
[5:0]
Power-down
timeout
This bit defines the period duration of the power-down timeout.
If the comparator outputs have not been activated during the programmed period, the part enters power-down
mode automatically. The part can be then returned to a normal operational mode either via the serial interface
or by the power supply off/on sequence.
The period is programmable in steps of 4 hours. For example, setting the value to 0x06 sets the duration to 24
hours. The maximum value of 0x3F corresponds to approximately 10.5 days.
The value of 0x00 disables the power-down timeout, and the part does not enter power-down mode automatically.
CAPDAC REGISTERS
Ch 1 Address Pointer 0x11
Ch 2 Address Pointer 0x12
8 Bits, Read/Write, Factory Preset 0xC0
Table 16. CAPDAC Registers Bit Map1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
DacEn
DacAuto
DacValue (6-bit value)
(1)
(0x00)
1 The default values are given in parentheses.
Table 17. CAPDAC Registers Bit Descriptions
Bit
Mnemonic
Description
7
DacEn
DacEn = 1 enables capacitive the DAC.
6
DacAuto
DacAuto = 1 enables the auto-DAC function in the adaptive threshold mode.
When the auto-DAC function is enabled, the part dynamically adjusts the CAPDAC to keep the CDC in an
optimal operating capacitive range. The CAPDAC value is automatically incremented when the data average
exceeds of the CDC full range, and the CAPDAC value is decremented when the data average goes below
of the CDC full range. The auto-DAC increment or decrement step depends on the selected CDC capacitive
input range.
This bit has no effect in fixed threshold mode; the auto-DAC function is always disabled in the fixed threshold mode.
[5:0]
DacValue
CAPDAC value, Code 0x00 ≈ 0 pF, Code 0x3F ≈ CAPDAC full range.
SERIAL NUMBER REGISTER
Address Pointer 0x13, Address Pointer 0x14, Address
Pointer 0x15, Address Pointer 0x16
32 Bits, Read Only, Factory Preset 0xXXXX
This register holds a serial number, unique for each individual part.
CHIP ID REGISTER
Address Pointer 0x17
8 Bits, Read Only, Factory Preset 0xXX
This register holds the chip identification code, used in factory
manufacturing and testing.
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