MCP3204-CI/ST Microchip Technology, MCP3204-CI/ST Datasheet - Page 19

• Manufacturer Part Number: MCP3204-CI/ST
• Description: IC ADC 12BIT 2.7V 4CH SPI14TSSOP
• Manufacturer: Microchip Technology

Specifications of MCP3204-CI/ST

• Data Interface: Serial, SPI™
• Number Of Bits: 12
• Sampling Rate (per Second): 100k
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP (0.173", 4.40mm Width)
• Resolution (bits): 12bit
• Sampling Rate: 100kSPS
• Input Channel Type: Pseudo Differential, Single Ended
• Supply Voltage Range - Analog: 2.7V To 5.5V
• Supply Current: 320µA
• Package: 14TSSOP
• Resolution: 12 Bit
• Architecture: SAR
• Number Of Adcs: 1
• Number Of Analog Inputs: 4|2
• Digital Interface Type: Serial (4-Wire, SPI)
• Input Type: Voltage
• Polarity Of Input Voltage: Unipolar
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.0
Communication with the MCP3204/3208 devices is
accomplished using a standard SPI-compatible serial
interface. Initiating communication with either device is
done by bringing the CS line low (see
device was powered up with the CS pin low, it must be
brought high and back low to initiate communication.
The first clock received with CS low and D
constitute a start bit. The SGL/DIFF bit follows the start
bit and will determine if the conversion will be done
using single-ended or differential input mode. The next
three bits (D0, D1 and D2) are used to select the input
channel configuration.
the configuration bits for the MCP3204 and MCP3208,
respectively. The device will begin to sample the
analog input on the fourth rising edge of the clock after
the start bit has been received. The sample period will
end on the falling edge of the fifth clock following the
start bit.
Once the D0 bit is input, one more clock is required to
complete the sample and hold period (D
care” for this clock). On the falling edge of the next
clock, the device will output a low null bit. The next 12
clocks will output the result of the conversion with MSB
first, as shown in
the device on the falling edge of the clock. If all 12 data
bits have been transmitted and the device continues to
receive clocks while the CS is held low, the device will
output the conversion result LSB first, as shown in
Figure
while CS is still low (after the LSB first data has been
transmitted), the device will clock out zeros indefinitely.
If necessary, it is possible to bring CS low and clock in
leading zeros on the D
often done when dealing with microcontroller-based
SPI ports that must send 8 bits at a time. Refer to
Section 6.1 “Using the MCP3204/3208 with Micro-
controller (MCU) SPI Ports” for more details on using
the MCP3204/3208 devices with hardware SPI ports.
© 2008 Microchip Technology Inc.
5-2. If more clocks are provided to the device
SERIAL COMMUNICATIONS
Figure
IN
Table 5-1
5-1. Data is always output from
line before the start bit. This is
and
Figure
Table 5-2
IN
IN
is a “don’t
5-1). If the
high will
show
TABLE 5-1:
TABLE 5-2:
* D2 is a “don’t care” for MCP3204
Single/
Single
/Diff
Diff
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
Control Bit
Control Bit
Selections
Selections
D2* D1 D0
D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
X
X
X
X
X
X
X
X
D1 D0
MCP3204/3208
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
CONFIGURATION BITS FOR
THE MCP3204
CONFIGURATION BITS FOR
THE MCP3208
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Configuration
Configuration
single-ended
single-ended
single-ended
single-ended
single-ended
single-ended
single-ended
single-ended
single-ended
single-ended
single-ended
single-ended
differential
differential
differential
differential
differential
differential
differential
differential
differential
differential
differential
differential
Input
Input
DS21298E-page 19
CH0 = IN+
CH2 = IN+
CH1 = IN+
CH3 = IN+
CH0 = IN+
CH1 = IN+
CH2 = IN+
CH3 = IN+
CH4 = IN+
CH5 = IN+
CH6 = IN+
CH7 = IN+
CH1 = IN-
CH0 = IN-
CH3 = IN-
CH2 = IN-
CH0 = IN-
CH2 = IN-
CH4 = IN-
CH6 = IN-
Selection
Selection
CH1 = IN-
CH3 = IN-
CH5 = IN-
CH7 = IN-
Channel
Channel
CH0
CH1
CH2
CH3
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7