MCP3423EV Microchip Technology, MCP3423EV Datasheet - Page 21

• Manufacturer Part Number: MCP3423EV
• Description: BOARD EVAL 18BIT 2CH ADC MCP3423
• Manufacturer: Microchip Technology

Specifications of MCP3423EV

• Number Of Adc's: 1
• Number Of Bits: 18
• Sampling Rate (per Second): 3.75
• Data Interface: Serial
• Inputs Per Adc: 2 Differential
• Input Range: ±VREF
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Utilized Ic / Part: MCP3423
• Silicon Manufacturer: Microchip
• Application Sub Type: ADC
• Kit Application Type: Data Converter
• Silicon Core Number: MCP3423
• 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