MCP3221 Microchip Technology, MCP3221 Datasheet - Page 12

• Manufacturer Part Number: MCP3221
• Description: Low Power 12-Bit A/D Converter With I2C Interface
• Manufacturer: Microchip Technology

MCP3221
3.0
TABLE 3-1:
3.1
The V
device as well as a voltage reference for the conversion
process. Refer to Section 6.4, “Device Power and
Layout Considerations”, for tips on power and
grounding.
3.2
AIN is the input pin to the sample-and-hold circuitry of
the Successive Approximation Register (SAR) con-
verter. Care should be taken in driving this pin. Refer to
Section 6.1, “Driving the Analog Input”. For proper con-
versions, the voltage on this pin can vary from V
V
DS21732B-page 12
DD
.
DD
Name
SDA
SCL
V
V
AIN
DD
SS
PIN FUNCTIONS
V
pin, with respect to V
Analog Input (AIN)
DD
and V
PIN FUNCTION TABLE
+2.7V to 5.5V Power Supply
Ground
Analog Input
Serial Data In/Out
Serial Clock In
SS
SS
Function
, provides power to the
SS
to
3.3
SDA is a bidirectional pin used to transfer addresses
and data into and out of the device. Since it is an open-
drain terminal, the SDA bus requires a pull-up resistor
to V
400 kHz SCL clock speeds). Refer to Section 6.2,
“Connecting to the I
For normal data transfer, SDA is allowed to change only
during SCL low. Changes during SCL high are reserved
for indicating the START and STOP conditions. Refer to
Section 5.1, “I
3.4
SCL is an input pin used to synchronize the data trans-
fer to and from the device on the SDA pin and is an
open-drain terminal. Therefore, the SCL bus requires a
pull-up resistor to V
2 k
Section 6.2, “Connecting to the I
For normal data transfer, SDA is allowed to change
only during SCL low. Changes during SCL high are
reserved for indicating the START and STOP
conditions. Refer to Section 6.1, “Driving the Analog
Input”.
DD
for 400 kHz SCL clock speeds. Refer to
(typically 10 k
Serial Data (SDA)
Serial Clock (SCL)
2
C Bus Characteristics”.
DD
2
C Bus”, for more information.
(typically 10 k for 100 kHz and
2003 Microchip Technology Inc.
for 100 kHz and 2 k
2
C Bus”).
for