MCP3422EV Microchip Technology, MCP3422EV Datasheet - Page 21
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MCP3422EV
Manufacturer Part Number
MCP3422EV
Description
BOARD EVAL MCP3422 PICKIT SERIAL
Manufacturer
Microchip Technology
Series
PICkit™r
Specifications of MCP3422EV
Number Of Adc's
2
Number Of Bits
18
Sampling Rate (per Second)
3.75
Data Interface
Serial
Inputs Per Adc
1 Differential
Input Range
±2.048 V
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 125°C
Utilized Ic / Part
MCP3422
Silicon Manufacturer
Microchip
Application Sub Type
ADC
Kit Application Type
Data Converter
Silicon Core Number
MCP3422
Kit Contents
Board, Software
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
TABLE 5-3:
FIGURE 5-3:
© 2009 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) (NOTES 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
DS22088C-page 21
Master