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参数资料
| 型号： | ADE7758ARWZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 59/72页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 3PHASE 24SOIC |
| 标准包装： | 1,000 |
| 输入阻抗： | 380 千欧 |
| 测量误差： | 0.1% |
| 电压 - 高输入/输出： | 2.4V |
| 电压 - 低输入/输出： | 0.8V |
| 电流 - 电源： | 8mA |
| 电源电压： | 4.75 V ~ 5.25 V |
| 测量仪表类型： | 3 相 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 带卷 (TR) |
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Data Sheet
SERIAL READ OPERATION
During a data read operation from the ADE7758 , data is shifted
out at the DOUT logic output on the rising edge of SCLK. As
was the case with the data write operation, a data read must be
preceded with a write to the communications register.
With the ADE7758 in communications mode and CS logic low,
an 8-bit write to the communications register takes place first.
The MSB of this byte transfer must be a 0, indicating that the
next data transfer operation is a read. The seven LSBs of this
byte contain the address of the register that is to be read. The
ADE7758 starts shifting out of the register data on the next
rising edge of SCLK (see Figure 94 ). At this point, the DOUT
logic output switches from a high impedance state and starts
driving the data bus. All remaining bits of register data are
shifted out on subsequent SCLK rising edges. The serial
interface enters communications mode again as soon as the
read is completed. The DOUT logic output enters a high
impedance state on the falling edge of the last SCLK pulse.
ADE7758
The read operation can be aborted by bringing the CS logic
input high before the data transfer is completed. The DOUT
output enters a high impedance state on the rising edge of CS.
When an ADE7758 register is addressed for a read operation,
the entire contents of that register are transferred to the serial
port. This allows the ADE7758 to modify its on-chip registers
without the risk of corrupting data during a multibyte transfer.
Note that when a read operation follows a write operation, the
read command (that is, write to communications register)
should not happen for at least 1.1 μs after the end of the write
operation. If the read command is sent within 1.1 μs of the write
operation, the last byte of the write operation can be lost.
ACCESSING THE ON-CHIP REGISTERS
All ADE7758 functionality is accessed via the on-chip registers.
Each register is accessed by first writing to the communications
register and then transferring the register data. For a full
description of the serial interface protocol, see the Serial
Interface section.
Rev. E | Page 59 of 72
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