MCP3422 Microchip Technology Inc., MCP3422 Datasheet - Page 21

• Manufacturer Part Number: MCP3422
• Description: 18-bit, Multi-channel ?? Analog-to-digital Converter With I2c? Interface And On-board Reference
• Manufacturer: Microchip Technology Inc.

TABLE 5-3:
FIGURE 5-3:
© 2008 Microchip Technology Inc.
Note 1:
SCL
SDA
A2
0
0
0
1
1
1
0
1
0
Start Bit by
Master
Address Bits
Note:
I
2
C Device
2:
3:
A1
0
0
1
0
0
1
1
1
0
Float: (a) Leave pin without connecting to
anything (left floating), or (b) apply
Addr_Float voltage.
The user can tie the pins to V
- Tie to V
- Tie to V
See Addr_Low, Addr_High, and
Addr_Float parameters in Electrical
Characteristics Table.
– Stop bit can be issued any time during writing.
– MCP3422/3/4 device code is 1101 (programmed at the factory).
– See
A0
0
1
0
0
1
0
1
1
0
ADDRESS BITS VS. ADDRESS
SELECTION PINS FOR
(MCP3423 AND MCP3424
ONLY) (NOTE 1, 2, 3)
1
1
Figure 5-1
SS
DD
0 (Addr_Low)
0 (Addr_Low)
0 (Addr_Low)
1 (Addr_High)
1 (Addr_High)
1 (Addr_High)
Float
Float
Float
Timing Diagram For Writing To The MCP3422/3/4.
1
for Addr_Low
for Addr_High
Logic Status of Address
Adr0 Pin
with Write command
0
Selection Pins
Address Byte
for details in Address Byte.
1st Byte:
1
A2 A1 A0
0 (Addr_Low)
Float
1 (Addr_High)
0 (Addr_Low)
Float
1 (Addr_High)
0 (Addr_Low)
1 (Addr_High)
Float
SS
R/W
Adr1 Pin
or V
MCP3422/3/4
DD
ACK by
:
9
1
C1 C0
5.3.3
When the Master sends an address byte with the R/W
bit low (R/W = 0), the device expects one configuration
byte following the address. Any byte sent after this
second byte will be ignored. The user can change the
operating mode of the device by writing the
configuration register bits.
If the device receives a write command with a new
configuration setting, the device immediately begins a
new conversion and updates the conversion data.
Configuration Byte
RDY
(a) One-Shot Mode: 1
(b) Continuous Mode: not effected
O/C
2nd Byte:
WRITING A CONFIGURATION BYTE
TO THE DEVICE
S1 S0 G1 G0
MCP3422/3/4
MCP3422/3/4
ACK by
9
Stop Bit by
DS22088B-page 21
Master