
difference between SMBus and I
2
C is that SMBus defines a standard set of read and
write protocols, rather than leaving these specifics up to the IC manufacturers.
Proprietary Serial Interfaces
Some ADCs have proprietary interfaces. The Maxim MAX1101 is a typical device.
This is an 8-bit ADC that is optimized for interfacing to CCDs. The MAX1101
uses four pins: MODE, LOAD, DATA, and SCLK. The MODE pin determines
whether data is being written or read (1 ¼ read, 0 ¼ write). The DATA pin is a
bidirectional signal, the SCLK signal clocks data into and out of the device, and
the LOAD pin is used after a write to clock the write data into the internal
registers. ...