MCP2030 Microchip Technology Inc., MCP2030 Datasheet - Page 47

• Manufacturer Part Number: MCP2030
• Description: Three-channel Analog Front-end Device
• Manufacturer: Microchip Technology Inc.

FIGURE 5-10:
© 2005 Microchip Technology Inc.
LFDATA/CCLK/SDIO
SCLK/ALERT
MCU SPI Write Details:
1.
2.
3.
4.
5.
6.
7.
Drive the open collector ALERT output low.
•
Drop CS.
•
•
Change LFDATA/CCLK/SDIO connected pin to output.
•
Clock in 16-bit SPI Write sequence – command, address, data and parity bit.
•
Change LFDATA/CCLK/SDIO connected pin to input.
Raise CS to complete the SPI Write.
Change SCLK/ALERT back to input.
CS
to ensure no false clocks occur when CS drops
SCLK/ALERT becomes SCLK input
LFDATA/CCLK/SDIO becomes SDI input
driving SPI data
command, address, data and parity bit
(output)
ALERT
LFDATA
(output)
SPI Write Sequence.
1
(input)
2
SCLK
(input)
T
SDI
CSSC
T
3
SU
MSb
T
HD
4
16 Clocks for Write Command, Address and Data
T
HI
1/F
SCLK
T
LO
LSb
T
5
SCCS
MCP2030
6
T
LFDATA
(output)
CS1
(output)
ALERT
DS21981A-page 47
T
7
CSH
T
CS0