wms7201 Winbond Electronics Corp America, wms7201 Datasheet - Page 6

• Manufacturer Part Number: wms7201
• Description: 256-tap Non-volatile Digital Potentiometer
• Manufacturer: Winbond Electronics Corp America

6. PIN DESCRIPTION
PIN NAME
CLK
CS
SDI
SDO
V
V
VA1
VB1
VW1
WP
DD
SS
1
1
PIN NO
NC
NC
2
1
3
8
4
7
5
6
I/O
O
O
I
I
I
I
-
-
-
-
Serial Clock pin. Data Shifts in one bit at a time on positive clock
(CLK) edges
Chip Select pin. When CS is HIGH, WMS7201 is deselected and
the SDO pin is at high impedance, and (unless an internal write
cycle is underway) the device will be in the standby state. CS LOW
enables WMS7201, placing it in the active power mode. It should
be noted that after a power-up, a HIGH to LOW transition on CS is
required prior to the start of any operation.
Serial Data Input pin. All opcodes, byte addresses and data to be
written to the registers are input on this pin. Data is latched by the
rising edge of the serial clock.
Serial Data Output pin with open-drain output. During a read cycle,
data is shifted out on this pin. Data is clocked out by the falling
edge of the serial clock except for the 1
by the falling edge of CS. Also can be used to daisy-chain several
parts. (Only 10-pin TSSOP package)
Hardware Write Protect pin. When active LOW WP prevents any
changes to the present contents except retrieving NVMEM
contents. (Only 10-pin TSSOP package)
Power Supply
Ground pin, logic ground reference
A terminal of potentiometer ‘1’, equivalent to the HI terminal
connection on a mechanical potentiometer
B terminal of potentiometer ‘1’, equivalent to the LO terminal
connection on a mechanical potentiometer
Wiper terminal of potentiometer ‘1’, equivalent to the wiper terminal
of a mechanical potentiometer
TABLE 1 – PIN DESCRIPTION
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DESCRIPTION
st
bit, which is clocked out
WMS7201