MCP3421 Microchip Technology, MCP3421 Datasheet - Page 16

• Manufacturer Part Number: MCP3421
• Description: 18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference
• Manufacturer: Microchip Technology

MCP3421
FIGURE 5-4:
5.4
The MCP3421 acknowledges the general call address
(0x00 in the first byte). The meaning of the general call
address is always specified in the second byte. Refer
to
general calls:
5.4.1
The general call reset occurs if the second byte is
‘00000110’ (06h). At the acknowledgement of this
byte, the device will abort current conversion and
perform an internal reset similar to a power-on-reset
(POR).
5.4.2
The general call conversion occurs if the second byte
is ‘00001000’ (08h). All devices on the bus initiate a
conversion simultaneously. For the MCP3421 device,
the configuration will be set to the One-Shot Conver-
sion mode and a single conversion will be performed.
The PGA and data rate settings are unchanged with
this general call.
DS22003B-page 16
Note:
Figure
SCL
SDA
Start Bit by
Master
Note:
General Call
5-5. The MCP3421 supports the following
GENERAL CALL RESET
GENERAL CALL CONVERSION
The I
“00000000” (00h) in the second byte.
– Stop bit can be issued any time during writing.
– MCP3421 device code is 1101.
– Address Bits A2- A0 = 000 are programmed at factory unless customer requests different codes.
2
C specification does not allow to use
1
1
Timing Diagram For Writing To The MCP3421.
1
MCP3421 Address Byte
with Write command
0
1st Byte:
1
A2 A1 A0
R/W
MCP3421
ACK by
9
1
C1 C0
FIGURE 5-5:
Format.
For more information on the general call, or other I
modes, please refer to the Phillips I
RDY
0 0 0 0 0 0 0 0 A
Configuration Byte
(General Call Address)
O/C
2nd Byte:
First Byte
S1 S0 G1 G0
MCP3421
ACK by
ACK
General Call Address
© 2006 Microchip Technology Inc.
x
9
x x x x x x x
Stop Bit by
2
Master
Second Byte
C specification.
LSB
ACK
A
2
C