Datasheet

MCP3302/04
DS21697F-page 26  2011 Microchip Technology Inc.
FIGURE 6-2: Communication with MCP3302/04 (MSB first Format).
FIGURE 6-3: Communication with MCP3302/04 (LSB first Format).
CS
CLK
D
IN
D
OUT
D1D2 D0
HI-Z
Don’t Care
Null
Bit
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 *
HI-Z
T
ACQ
T
CONV
SGL/
DIFF
Start
T
SAMPLE
T
CSH
T
SAMPLE
D2
SGL/
DIFF
Start
* After completing the data transfer, if further clocks are applied with CS low, the A/D Converter will output LSB
first data, followed by zeros indefinitely. See Figure 6-3 below.
** T
DATA
: during this time, the bias current and the comparator power down while the reference input becomes
a high-impedance node, leaving the CLK running to clock out the LSB-first data or zeros.
†
When operating in Single-ended mode, the sign bit will always be transmitted as a ‘0’.
T
DATA
**
T
SUCS
SB†
Null
Bit
B11 B10 B9 B8 B7 B6 B5 B4
B3 B2 B1
B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11
CS
CLK
D
OUT
HI-Z
HI-Z
(MSB)
T
CONV
T
DATA
**
Power Down
T
ACQ
Start
SGL/
DIFF
D
IN
T
SAMPLE
T
CSH
D0D1D2
* After completing the data transfer, if further clocks are applied with CS low, the A/D Converter will output zeros
indefinitely.
** T
DATA
: During this time, the bias circuit and the comparator power down while the reference input becomes
a high-impedance node, leaving the CLK running to clock out LSB first data or zeroes.
†
When operating in Single-ended mode, the sign bit will always be transmitted as a ‘0’.
T
SUCS
Don’t Care
SB†
SB*