MCP4341-103E/P Microchip Technology, MCP4341-103E/P Datasheet - Page 44
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MCP4341-103E/P
Manufacturer Part Number
MCP4341-103E/P
Description
Non-Volatile, 7-Bit (129 Wiper Steps) Digital Potentiometers; Package: 20-PDIP; Temperature Range: -40C to +125C; Container: Tube
Manufacturer
Microchip Technology
Datasheet
1.MCP4341-103EP.pdf
(80 pages)
MCP434X/436X
6.1
The operation of the four SPI interface pins are
discussed in this section. These pins are:
• SDI (Serial Data In)
• SDO (Serial Data Out)
• SCK (Serial Clock)
• CS (Chip Select)
The serial interface works on either 8-bit or 16-bit
boundaries depending on the selected command. The
Chip Select (CS) pin frames the SPI commands.
6.1.1
The Serial Data In (SDI) signal is the data signal into
the device. The value on this pin is latched on the rising
edge of the SCK signal.
6.1.2
The Serial Data Out (SDO) signal is the data signal out
of the device. The value on this pin is driven on the
falling edge of the SCK signal.
Once the CS pin is forced to the active level (V
V
pin is determined by the serial bit’s position in the
command, the command selected, and if there is a
command error state (CMDERR).
6.1.3
The SPI interface is specified to operate up to 10 MHz.
The actual clock rate depends on the configuration of
the system and the serial command used.
shows the SCK frequency for different configurations.
TABLE 6-1:
DS22233A-page 44
Non-Volatile
Memory
Volatile
Memory
Note 1:
IHH
Memory Type Access
), the SDO pin will be driven. The state of the SDO
2:
3:
SDI, SDO, SCK, and CS Operation
Non-Volatile memory does not support the
Increment or Decrement command.
After a Write command, the internal write
cycle must complete before the next SPI
command is received.
This is the maximum clock frequency
without an external pull-up resistor.
SERIAL DATA IN (SDI)
SERIAL DATA OUT (SDO)
SERIAL CLOCK (SCK)
(SPI FREQUENCY OF OPERATION)
SDI, SDO
SDI, SDO
SCK FREQUENCY
10 MHz
10 MHz
Read
Command
10 MHz
Decrement
Increment,
10 MHz
Write,
Table 6-1
(1, 2)
IL
or
6.1.4
The Chip Select (CS) signal is used to select the device
and frame a command sequence. To start a command,
or sequence of commands, the CS signal must
transition from the inactive state (V
(V
After the CS signal has gone active, the SDO pin is
driven and the clock bit counter is reset.
If an error condition occurs for an SPI command, then
the Command byte’s Command Error (CMDERR) bit
(on the SDO pin) will be driven low (V
error condition, the user must take the CS pin to the V
level.
When the CS pin returns to the inactive state (V
SPI module resets (including the address pointer).
While the CS pin is in the inactive state (V
interface is ignored. This allows the Host Controller to
interface to other SPI devices using the same SDI,
SDO, and SCK signals.
The CS pin has an internal pull-up resistor. The resistor
is disabled when the voltage on the CS pin is at the V
level. This means that when the CS pin is not driven,
the internal pull-up resistor will pull this signal to the V
level. When the CS pin is driven low (V
resistance becomes very large to reduce the device
current consumption.
The high voltage capability of the CS pin allows High
Voltage commands. High Voltage commands allow the
device’s WiperLock Technology and write protect
features to be enabled and disabled.
IL
Note:
or V
IHH
).
THE CS SIGNAL
There is a required delay after the CS pin
goes active to the 1st edge of the SCK pin.
© 2009 Microchip Technology Inc.
IH
) to an active state
IL
). To exit the
IH
), the serial
IL
IH
), the
) the
IH
IH
IL