MCP2030 datasheet(49/66 Pages) MICROCHIP

49 / 66 page

DS21981A-page 49

MCP2030

5.31.2

COMMAND DECODER/

CONTROLLER

The circuit executes 8 SPI commands from the external

MCU. The command structure is:

Command (3 bits) + Configuration Address (4 bits) +

Data Byte and Row Parity Bit with the Most Significant

bit first. Table 5-5 shows the available SPI commands.

The device operates in SPI mode 0,0. In mode 0,0 the

clock idles in the low state (Figure 5-12). SDI data is

loaded into the device on the rising edge of SCLK and

SDO data is clocked out on the falling edge of SCLK.

There must be multiples of 16 clocks (SCLK) while CS

is low or commands will abort.

TABLE 5-5:

SPI COMMANDS

Command

Address

Data

Row

Parity

Description

Command only – Address and Data are “Don’t Care”, but need to be clocked in regardless.

000

XXXX

XXXX XXXX

Clamp on – enable modulation circuit

001

XXXX

XXXX XXXX

Clamp off – disable modulation circuit

010

XXXX

XXXX XXXX

Enter Sleep mode (any other command wakes the AFE)

011

XXXX

XXXX XXXX

AGC Preserve On – to temporarily preserve the current AGC level

100

XXXX

XXXX XXXX

AGC Preserve Off – AGC again tracks strongest input signal

101

XXXX

XXXX XXXX

Soft Reset – resets various circuit blocks

Read Command – Data will be read from the specified register address.

110

0000

Config Byte 0

General – options that may change during normal operation

0001

Config Byte 1

LCX antenna tuning and LFDATA output format

0010

Config Byte 2

LCY antenna tuning

0011

Config Byte 3

LCZ antenna tuning

0100

Config Byte 4

LCX and LCY sensitivity reduction

0101

Config Byte 5

LCZ sensitivity reduction and modulation depth

0110

Column Parity

Column parity byte for Config Byte 0 -> Config Byte 5

0111

Status

Status – parity error, which input is active, etc.

Write Command – Data will be written to the specified register address.

111

0000

Config Byte 0

Output enable filter, channel enable/disable, etc.

0001

Config Byte 1

LCX antenna tuning and LFDATA output type

0010

Config Byte 2

LCY antenna tuning

0011

Config Byte 3

LCZ antenna tuning

0100

Config Byte 4

LCX and LCY sensitivity reduction

0101

Config Byte 5

LCZ sensitivity reduction and modulation depth

0110

Column Parity

Column parity byte for Config Byte 0 -> Config Byte 5

0111

Not Used

Note:

‘P’ denotes the row parity bit (odd parity) for the respective data byte.

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