MCP4018 MICROCHIP [Microchip Technology], MCP4018 Datasheet - Page 36

• Manufacturer Part Number: MCP4018
• Manufacturer: MICROCHIP [Microchip Technology]

MCP4017/18/19
5.2.9
The MCP4017/18/19 is a slave I
supports 7-bit slave addressing. The slave address
contains seven fixed bits.
byte format.
5.2.9.1
The Control Byte is always preceded by a START
condition. The Control Byte contains the slave address
consisting of seven fixed bits and the R/W bit.
9
the I
FIGURE 5-9:
I
FIGURE 5-10:
DS22147A-page 36
2
Start
bit
A = 0 = Slave Device Acknowledges byte
A = 1 = Slave Device does not Acknowledge byte
A bit (controlled by slave device)
S A6 A5 A4 A3 A2 A1 A0 R/W A/A
C Control Byte.
shows the control byte format and
2
“0” “1” “0” “1” “1” “1” “1”
C address for the devices.
S
S
The Following is a “Hardware General Call” Format
0 0 0
0 0 0
Reserved 7-bit Commands (By I
General Call Address
I
General Call Address
2
C COMMAND PROTOCOL
Control Byte (Slave Address)
Slave Address
‘0000 011’b - Reset and write programmable part of slave address by hardware.
‘0000 010’b - Write programmable part of slave address by hardware.
‘0000 000’b - NOT Allowed
0
0
Slave Address Bits in the
General Call Formats.
0 0 0 0
0 0 0 0
R/W bit
R/W = 0 = write
R/W = 1 = read
Figure 5-9
2
shows the control
C device which
A
Table 5-2
A
x
x
“7-bit Command”
2
“7-bit Command”
C Specification - Philips # 9398 393 40011, Ver. 2.1 January 2000)
x
Figure 5-
x
shows
Second Byte
Second Byte
x
x
x
x
X
X
x
x
TABLE 5-2:
5.2.9.2
The MCP4017/MCP4018/MCP4019 does not support
hardware address bits.
5.2.10
The General Call is a method that the Master device
can communicate with all other Slave devices.
The MCP4017/18/19 devices do not respond to
General Call address and commands, and therefore
the communications are Not Acknowledged.
x
MCP4017
MCP4018
MCP4019
x
Device
0 A P
1 A
This indicates a “Hardware General Call”
MCP4016/7/8/9 will ignore this byte and
all following bytes (and A), until
a Stop bit (P) is encountered.
x
GENERAL CALL
n occurrences of (Data + A / A)
Hardware Address Pins
I
x
2
‘0101111’
‘0101111’
‘0101111’
C Address
DEVICE I
x
x
© 2009 Microchip Technology Inc.
X
2
x
C ADDRESS
x
Comment
X A P