MCP4131 MICROCHIP [Microchip Technology], MCP4131 Datasheet - Page 41

• Manufacturer Part Number: MCP4131
• Description: 7/8-Bit Single/Dual SPI Digital POT with Volatile Memory
• Manufacturer: MICROCHIP [Microchip Technology]

6.0
The MCP4XXX devices support the SPI serial protocol.
This SPI operates in the slave mode (does not
generate the serial clock).
The SPI interface uses up to four pins. These are:
• CS - Chip Select
• SCK - Serial Clock
• SDI - Serial Data In
• SDO - Serial Data Out
FIGURE 6-1:
© 2008 Microchip Technology Inc.
Typical SPI Interface Connections
Alternate MCP41X1 SPI Interface Connections (Host Controller Firmware SPI)
SERIAL INTERFACE (SPI)
Typical MCP41X1 SPI Interface Connections (Host Controller Hardware SPI)
Note 1: If High voltage commands are desired, some type of external circuitry needs to be
2: R
Controller
Controller
Controller
implemented.
1
Typical SPI Interface Block Diagram.
Host
Host
Host
must be sized to ensure V
(SDO/SDI)
(SCK)
I/O
I/O
I/O
I/O
SDO
SDO
SDI
SDI
SCK
SCK
I/O
(1)
(1)
(1)
( Master Out - Slave In (MOSI) )
( Master In - Slave Out (MISO) )
MCP413X/415X/423X/425X
IL
and V
R
1
(2)
IH
of the devices are met.
Typical SPI Interfaces are shown in
SPI interface, The Master’s Output pin is connected to
the Slave’s Input pin and the Master’s Input pin is
connected to the Slave’s Output pin.
The MCP4XXX SPI’s module supports two (of the four)
standard SPI modes. These are Mode
The SPI mode is determined by the state of the SCK
pin (V
inactive (V
All SPI interface signals are high-voltage tolerant.
IH
or V
IH
IL
) to active (V
) on the when the CS pin transitions from
IL
SDI/SDO
SDI/SDO
SCK
SCK
or V
SDI
SCK
CS
SDO
CS
CS
MCP41X1
MCP4XXX
MCP41X1
IHH
).
DS22060B-page 41
Figure
0,0
SDI
SDO
SDI
SDO
6-1. In the
and
1,1
.