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MAX71020

Single-Chip Electricity Meter AFE

Table 4. Temperature Measurement Registers

NAME

RST

WK

DIR

DESCRIPTION

Sets the period betwee n temperature measurements.

TEMP_PER

TIME

TEMP_PER[1:0]

0

—

R/W

0

1

Manual updates (see TEMP_START description)

Every accumulation cycle

2

3

Continuous

No updates

TEMP_PER[1:0] must be zero in order for TEMP_START to function. If TEMP_

PER[1:0] = 0, then setting TEMP_START starts a temperature measurement.

TEMP_START

0

—

R/W

Hardware clears

TEMP_START when the temperature measurement is complete. The host

controller must wait for TEMP_START to clear before reading STEMP[10:0]

and before setting TEMP_START again.

STEMP[15:0]

VSENSE[7:0]

—

—

—

—

R

R

The result of the temperature measurement.

The result of the temperature measurement (see the formula listed in the

Electrical Characteristics table).

SPI Slave Port

The slave SPI port communicates directly with the host

controller and allows it to read and write the device

control registers. The interface to the slave port consists

of the SPI_CSZ, SPI_CLK, SPI_DI, and SPI_DO pins. The

host can also reset the MAX71020 through the SPI port by

writing a data pattern to the RESET register (see Table 7 ).

SPI Transactions

SPI transactions are configured to provide immunity to

electrical noise through redundancy in the command

segment and error checking in the data field. The

MAX71020 SPI transaction is exactly 64 bits; transactions

of any other length are rejected. Each SPI transaction has

the following fields (see Table 5 ):

● A 24-bit setting packet, consisting of

? 11-bit address, MSB first

? 1-bit direction (1 means read)

? 11-bit inverted address, MSB first

? 1-bit inverted direction

● An 8-bit status, consisting of the following bits

concerning the last transaction, starting from bit 7:

? Parity of the status byte (0 or 1 could be correct)

? FIFO overflow status bit (1 means error)

? FIFO underrun status bit (1 means error)

? Read or write data parity (0 or 1 could be correct)

(never both read and write; address is not included

in the parity)

Maxim Integrated

? Address or direction mismatch error bit

(1 means error) (1: error, 0 : no error)

A

? bit indicating whether or not the bit count was

exactly 64 (1 means error)

? Out of bounds address, most likely due to SPI

safe bit or the memory manager (1 means error)

● A 32-bit packet of data, MSB first

If extra clocks are provided at the end during a read, all

zero is output and the status continues to be updated,

signaling an error. If extra clocks are provided at the

end during a write, the write is aborted and the status is

updated to signal an error.

● None of the fields above are optional.

● If an error is detected during the address or direction

phase, no action is taken.

● SPI_DO is high-Z while SPI_CSZ is high.

● SPI safe mode is supported, and SPI is not locked

out of this bit during SPI safe.

A typical SPI transaction is as follows. While SPI_CSZ

is high, the port is held in an initialized/reset state.

During this state, SPI_DO is held in high-Z state and all

transitions on SPI_CLK and SPI_DI are ignored. When

SPI_CSZ falls, the port begins the transaction on the first

rising edge of SPI_CLK. A transaction consists of the

fields shown in Table 5 .

14

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相关代理商/技术参数

MAX71020AEUI+R 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single-Chip Electricity Meter AFE

MAX710C/D 功能描述:直流/直流开关转换器 3.3V/5V or Adjustable Step-Up Step-Down DC-DC Converters RoHS:否制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT

MAX710C/D DIE 制造商:Maxim Integrated Products 功能描述:

MAX710ESE 功能描述:直流/直流开关转换器 3.3/5V or Adjustable Step-Up Step-Down RoHS:否制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT

MAX710ESE+ 功能描述:直流/直流开关转换器 3.3/5V or Adjustable Step-Up Step-Down RoHS:否制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT

MAX710ESE+ 制造商:Maxim Integrated Products 功能描述:CONVERTOR DC/DC ((NW))

MAX710ESE+T 功能描述:直流/直流开关转换器 3.3/5V or Adjustable Step-Up Step-Down RoHS:否制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT

MAX710ESE-T 功能描述:直流/直流开关转换器 3.3/5V or Adjustable Step-Up Step-Down RoHS:否制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT