MCP40D19 MICROCHIP [Microchip Technology], MCP40D19 Datasheet - Page 36

• Manufacturer Part Number: MCP40D19
• Manufacturer: MICROCHIP [Microchip Technology]

MCP40D17/18/19
5.2.9
The MCP40D17/18/19 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
All devices are offered with the I
“0101110”, while the MCP40D18 also offers a second
standard I
FIGURE 5-9:
I
FIGURE 5-10:
DS22152B-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 (Slave Address = “0101110”).
shows the control byte format and
2
“0” “1” “0” “1” “1” “1” “0”
C address for the devices.
S
S
The Following is a “Hardware General Call” Format
0 0 0
0 0 0
2
C slave address of “0111110”.
Reserved 7-bit Commands (By I
I
General Call Address
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
C slave address of
shows the control
2
C device which
Table 5-2
A
A
X X X X
X X X X
“7-bit Command”
2
“7-bit Command”
C Specification - Philips # 9398 393 40011, Ver. 2.1 January 2000)
Figure 5-
shows
Second Byte
Second Byte
X
X
X X 0 A
X X 1 A
TABLE 5-2:
5.2.9.2
The MCP40D17/MCP40D18/MCP40D19 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 MCP40D17/18/19 devices do not respond to
General Call address and commands, and therefore
the communications are Not Acknowledged.
MCP40D17
MCP40D18
MCP40D19
Device
This indicates a “Hardware General Call”
MCP40D17/18/19 will ignore this byte and
all following bytes (and A), until a Stop bit
(P) is encountered.
GENERAL CALL
X X X X
P
n occurrences of (Data + A / A)
Hardware Address Pins
I
‘0101110’
‘0101110’
‘0111110’
‘0101110’
2
C Address
DEVICE I
© 2009 Microchip Technology Inc.
X
2
C ADDRESS
X X X
MCP40D18-xxxE/LT
MCP40D18-xxxAE/LT
Comment
A P