Datasheet

78M6610+PSU Data Sheet
4.2 SPI Interface
The Maxim device operates as a SPI slave. The host is expected to instigate and control all transactions.
The signals used for SPI communication are defined as:
• SSB : (also known as CSB) the device SPI chip/slave select signal (active low)
• SCK : the clocking signal that clocks MISO and MOSI (data)
• SDI : (also known as MOSI) the data shifted into the measurement device
• SDO : (also known as MISO) the data shifted out of the measurement device
In Maxim embedded measurement devices, these signals may have alternate functionality depending
upon the device mode and/or firmware.
SPI Mode
The device operates as a slave in mode 3 (CPOL=1,CPHA==1) and as such the data is captured on the
rising edge and propagated on the falling edge of the serial data clock(SCK). Figure 1 shows a single-
byte transaction on the SPI bus. Bytes are transmitted/received MSB first.
SCK
MSB 6 5
4 3 2 1
MSB
6 5
4 3 2 1
LSB
SDI
SDO
LSB
SSB
Figure 4-2: Signal Timing on the SPI Bus
48 Rev 3