MCP3422A0-E/SN Microchip Technology, MCP3422A0-E/SN Datasheet - Page 12

• Manufacturer Part Number: MCP3422A0-E/SN
• Description: IC ADC 18BIT3.75SPS 2CH 8-SOIC
• Manufacturer: Microchip Technology

Specifications of MCP3422A0-E/SN

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Number Of Bits: 18
• Sampling Rate (per Second): 3.75
• Data Interface: I²C, Serial
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Architecture: Delta-Sigma
• Conversion Rate: 0.00375 KSPs
• Input Type: Voltage
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP3422EV - BOARD EVAL MCP3422 PICKIT SERIAL
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP3422/3/4
FIGURE 3-1:
3.3
SCL is the serial clock pin of the I
device act only as a slave and the SCL pin accepts
only external serial clocks. The input data from the
Master device is shifted into the SDA pin on the rising
edges of the SCL clock and output from the slave
device occurs at the falling edges of the SCL clock.
The SCL pin is an open-drain N-channel driver.
Therefore, it needs a pull-up resistor from the V
to the SCL pin. Refer to Section 5.3 “I
munications” for more details of I
communication.
DS22088C-page 12
Serial Clock Pin (SCL)
V
L
EGEND
R
SS
C
CHn
R
PIN
V
SS
V
T
CHn
Equivalent Analog Input Circuit.
=
=
=
=
=
Signal Source
Source Impedance
Analog Input Pin
Input Pin Capacitance
Threshold Voltage
4 pF
C
2
PIN
2
C Serial Interface
C interface. The
2
C Serial Com-
D
D
1
2
V
DD
DD
V
V
T
T
line
= 0.6V
= 0.6V
I
V
LEAKEAGE
C
SS
SAMPLE
D
1
, D
3.4
SDA is the serial data pin of the I
pin is used for input and output data. In read mode, the
conversion result is read from the SDA pin (output). In
write mode, the device configuration bits are written
(input) though the SDA pin. The SDA pin is an open-
drain N-channel driver. Therefore, it needs a pull-up
resistor from the V
start and stop conditions, the data on the SDA pin must
be stable during the high period of the clock. The high
or low state of the SDA pin can only change when the
clock signal on the SCL pin is low. Refer to Section 5.3
“I
Serial Interface communication.
Typical range of the pull-up resistor value for SCL and
SDA is from 5 kΩ to 10 kΩ for standard (100 kHz) and
fast (400 kHz) modes, and less than 1 kΩ for high
speed mode (3.4 MHz).
3.5
There is an internal electrical connection between the
Exposed Thermal Pad (EP) and the V
be connected to the same potential on the Printed
Circuit Board (PCB).
SS
R
I
(~ ±1 nA)
2
LEAKAGE
S
2
C Serial Communications” for more details of I
=
=
=
=
=
Exposed Thermal Pad (EP)
Serial Data Pin (SDA)
Leakage Current at Analog Pin
Sampling Switch
Sampling Switch Resistor
Sample Capacitance
ESD Protection Diode
SS
DD
Sampling
Switch
line to the SDA pin. Except for
© 2009 Microchip Technology Inc.
R
S
2
C interface. The SDA
C
(3.2 pF)
SS
SAMPLE
pin; they must
2
C