参数资料
型号: AD7142ACPZ-500RL7
厂商: Analog Devices Inc
文件页数: 10/73页
文件大小: 0K
描述: IC CAP-TO-DGTL CONV PROG 32LFCSP
标准包装: 1
类型: 电容数字转换器
分辨率(位): 16 b
采样率(每秒): 250k
数据接口: 串行
电压电源: 单电源
电源电压: 2.6 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘,CSP
供应商设备封装: 32-LFCSP-VQ(5x5)
包装: 标准包装
其它名称: AD7142ACPZ-500RL7DKR
AD7142
Rev. A | Page 17 of 72
Low Power Mode CDC Conversion Sequence Time with
Delay
The frequency of each CDC conversion operating in the low
power automatic wake-up mode is controlled by using the
LP_CONV_DELAY register located at Address 0x000[3:2], in
addition to the registers listed in Table 10. This feature provides
some flexibility for optimizing the conversion time to meet
system requirements vs. AD7142 power consumption.
For example, maximum power savings is achieved when the
LP_CONV_DELAY register is set to 3. With a setting of 3, the
AD7142 automatically wakes up, performing a conversion
every 800 ms.
Table 11. LP_CONV_DELAY Settings
LP_CONV_DELAY Bits
Delay Between Conversions
00
200 ms
01
400 ms
10
600 ms
11
800 ms
Figure 27 shows a simplified timing example of the low power
CDC conversion time. As shown, the low power CDC conversion
time is set by tCONV_FP and the LP_CONV_DELAY register.
05
70
2-
01
6
CONVERSION
SEQUENCE N
CDC
CONVERSION
SEQUENCE N+1
LP_CONV_DELAY
tCONV_FP
tCONV_LP
Figure 27. Low Power Mode CDC Conversion Sequence Time
CDC CONVERSION RESULTS
Certain high resolution sensors require the host to read back
the CDC conversion results for processing. The registers
required for host processing are located in the Bank 3 registers.
The host processes the data readback from these registers using
a software algorithm, to determine position information.
In addition to the results registers in the Bank 3 registers, the
AD7142 provides the 16-bit CDC output data directly, starting
at Address 0x00B of Bank 1. Reading back the CDC 16-bit
conversion data register allows for customer-specific application
data processing.
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