MCP3910 datasheet(47/90 Pages) MICROCHIP

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DS20005116D-page 47

MCP3910

6.4

Writing to the Device

The first register written from the SDI pin to the device

is the one defined by the Address bits (A[4:0]) given in

the control byte. After this first register is fully

transmitted, if the CS pin is maintained logic low, the

communication continues without an additional control

byte and the SDI pin transmits another register with the

address automatically incremented.

Two different Write mode configurations for the

address increment can be defined through the WRITE

bit in the STATUSCOM register (see Section 6.5

“Continuous Communications, Looping on Regis-

ter Sets”

and Table 9-2). The SDO pin stays in a

high-impedance state during a write communication.

The data on SDI are clocked into the MCP3910 on the

rising edge of SCK. The writing format for each register

is defined in Section 5.5 “ADC Output Coding”. A

write on an undefined or non-writable address, such as

the ADC channel’s register addresses, will have no

effect nor will it increment the address counter.

FIGURE 6-4:

Write to a Single Register with 24-Bit Format (WIDTH_CRC = 0, SPI Mode 1,1).

FIGURE 6-5:

Write to a Single Register with 24-Bit Format (WIDTH_CRC = 0, SPI Mode 0,0).

WRITE Communication (SPI mode 1,1)

Don’t care

SCK

SDI

SDO

Hi-Z

Device latches SDI on rising edge

R/W

Don’t

care

DATA<0>

High Z

WRITE Communication (SPI mode 0,0)

Don’t care

SCK

SDI

SDO

Hi-Z

Device latches SDI on rising edge

Don’t care

DATA<23>

High Z

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