MIC2593 datasheet(15/26 Pages) STMICROELECTRONICS

15 / 26 page

April 2004

M9999-042204

MIC2593

Micrel

MIC2593 Register Set and Programmer’s Model

Target Register

Command Byte Value

Power-On

Default

Label

Description

Read

Write

RESERVED

Do not Use

n/a

RESERVED

Do not Use

n/a

CNTRLA

Control Register Slot A

CNTRLB

Control Register Slot B

STATA

Slot A Status

STATB

Slot B Status

Common Status Register

xxxx 0000

Reserved

Reserved / Do Not Use

h - FFh

Undefined

Table 4. MIC2593 Register Addresses

S 1001 A2 A1 A0 0 A 000000 X X A

D3 D2 D1 D0

MIC2593 Slave Address

DATA

CLK

Command Byte to MIC2593

Data Byte to MIC2593

START

STOP

R/W = WRITE

ACKNOWLEDGE

Master to slave transfer,

i.e., DATA driven by master.

Slave to master transfer,

i.e., DATA driven by slave.

Figure 9. WRITE_BYTE Protocol

S 1001 A2 A1 A0

A2 A1 A0

0 A 000000 XXAS 1

D3 D2 D1 D0

A D7

/A P

MIC2593 Slave Address

DATA

CLK

Command Byte to MIC2593

MIC2593 Slave Address

Data Read From MIC2593

START

STOP

R/W = WRITE

R/W = READ

ACKNOWLEDGE

NOT ACKNOWLEDGE

Master to slave transfer,

i.e., DATA driven by master.

Slave to master transfer,

i.e., DATA driven by slave.

Figure 10. READ_BYTE Protocol

S 1001 A2 A1 A0 1A

D3 D2 D1 D0

/A P

MIC2593 Slave Address

DATA

CLK

Byte Read from MIC2593

START

STOP

R/W = READ

ACKNOWLEDGE

NOT ACKNOWLEDGE

Master to slave transfer,

i.e., DATA driven by master.

Slave to master transfer,

i.e., DATA driven by slave.

Figure 11. RECEIVE_BYTE Protocol

Inputs

MIC2593 Slave Address

Binary

Hex

1000 000

1000 001

1000 010

1000 011

1000 100

1000 101

1000 110

1000 111

Table 3. MIC2593 SMBus Addressing

dure may be used. To perform a Receive_Byte operation, the

host sends an address byte to select the slave MIC2593, with

the R/W bit set to the high (read) state, and then retrieves the

data byte. Figures 9 through 11 show the formats for these

data read and data write procedures.

The Command Register is eight bits (one byte) wide. This

byte carries the address of the MIC2593’s register to be

operated upon. The command byte values corresponding to

the various MIC2593 register addresses are shown in Table

4. Command byte values other than 0000 0XXX

b = 00h - 07h

are reserved and should not be used.

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