MIC2827 Datasheet, PDF (17/27 Pages) Micrel Semiconductor – Triple Output PMIC with HyperLight Load™ DCDC, two LDOs, and I2C Control

Micrel, Inc.
Serial Port Operation
The MIC2827 uses standard Write_Byte, Read_Byte,
and Read_Word operations for communication with its
host. The Write_Byte operation involves sending the
device’s address (with the R/W bit low to signal a write
operation), followed by the register address and the
command byte. The Read_Byte operation is a composite
write and read operation; the host first sends the
device’s address followed by the register address, as in
a write operation. A new start bit must then be sent to
MIC2827
the MIC2827, followed by a repeat of the device address
with the R/W bit (LSB) set to the high (read) state. The
data to be read from the part may then be clocked out.
These protocols are shown in Figure 1 and Figure 2.
The Register Address is eight bits (one byte) wide. This
byte carries the address of the MIC2827 register to be
operated upon. Only the lower three bits are used.
Figure 1: Write_Byte protocol
Figure 2: Read_Byte protocol
July 2009
17
M9999-072709-A