MCP3201-BI/P Microchip Technology Inc., MCP3201-BI/P Datasheet - Page 14

• Manufacturer Part Number: MCP3201-BI/P
• Description: A/D Converter, 12-Bit, 2.7V, SPI, Single Channel, PDIP-8
• Manufacturer: Microchip Technology Inc.

Specifications of MCP3201-BI/P

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

MCP3201
5.0
Communication with the device is done using a stan-
dard SPI-compatible serial interface. Initiating commu-
nication with the MCP3201 begins with the CS going
low. If the device was powered up with the CS pin low,
it must be brought high and back low to initiate commu-
nication. The device will begin to sample the analog
input on the first rising edge after CS goes low. The
sample period will end in the falling edge of the second
clock, at which time the device will output a low null bit.
The next 12 clocks will output the result of the conver-
FIGURE 5-1:
FIGURE 5-2:
DS21290D-page 14
D
D
CLK
CLK
CS
CS
OUT
OUT
SERIAL COMMUNICATIONS
t
SAMPLE
* After completing the data transfer, if further clocks are applied with CS low, the A/D Converter will output zeros indefinitely.
** t
* After completing the data transfer, if further clocks are applied with CS low, the A/D Converter will output LSB first data, followed
** t
node, leaving the CLK running to clock out the LSB-first data or zeros.
by zeros indefinitely. See Figure below.
node, leaving the CLK running to clock out the LSB-first data or zeros.
HI-Z
DATA
DATA
HI-Z
Communication with MCP3201 using MSB first Format.
Communication with MCP3201 using LSB first Format.
: during this time, the bias current and the comparator power down and the reference input becomes a high impedance
: during this time, the bias current and the comparator power down and the reference input becomes a high impedance
t
SUCS
T
SAMPLE
NULL
BIT
T
SUCS
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
NULL
BIT B11 B10
t
CONV
B9
B8
t
CYC
B7
t
CONV
B6
B5
t
CYC
B4
sion with MSB first, as shown in Figure 5-1. Data is
always output from 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 5-2. If more clocks are pro-
vided to the device while CS is still low (after the LSB
first data has been transmitted), the device will clock
out zeros indefinitely.
B3
B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11*
B2
B1
T
CSH
B0*
t
DATA
P
t
DATA
OWER
**
**
P
D
HI-Z
OWER
OWN
D
© 2007 Microchip Technology Inc.
OWN
NULL
BIT
t
CSH
B11 B10
HI-Z
B9
B8