X9421WV14IZ Datasheet, PDF (4/20 Pages) Intersil Corporation – Single Voltage Potentiometer

X9421
(14 LD TSSOP)
TOP VIEW
S0 1
NC 2
NC 3
CS 4
SCK 5
SI 6
VSS 7
14 VCC
13 R_L/V_L
12 RH/VH
11 R_W/V_W
10 HOLD
9 A0
8 WP
X9421
X9421
(16 LD SOIC)
TOP VIEW
NC 1
SO 2
NC 3
CS 4
SCK 5
SI 6
NC 7
VSS 8
16 VCC
15 NC
14 R_L/V_L
13 R_H/V_H
12 R_W/V_W
11 ISEN
10 AO
9 WP
Pin Assignments
TSSOP
PIN NO.
SOIC
PIN NO.
1
2
2, 3
3, 1, 7, 5
4
4
5
5
6
6
7
8
8
9
9
10
10
11
12
12
13
13
14
14
16
SYMBOL
SO
NC
CS
SCK
SI
VSS
WP
A0
HOLD
R_W/V_W
R_H/V_H
R_L/V_L
VCC
DESCRIPTION
Serial Data Output
No Connect
Chip Select
Serial Clock
Serial Data Input
System Ground
Hardware Write Protect
Device Address
Device select. Pause the serial bus.
Wiper Terminal of the Potentiometer.
High Terminal of the Potentiometer.
Low Terminal of the Potentiometer.
System Supply Voltage
Pin Descriptions
Host Interface Pins
SERIAL OUTPUT (SO)
SO is a push/pull serial data output pin. During a read cycle,
data is shifted out on this pin. Data is clocked out by the
falling edge of the serial clock.
SERIAL INPUT
SI is the serial data input pin. All opcodes, byte addresses
and data to be written to the potentiometer and pot register
are input on this pin. Data is latched by the rising edge of the
serial clock.
SERIAL CLOCK (SCK)
The SCK input is used to clock data into and out of the
X9421.
CHIP SELECT (CS)
When CS is HIGH, the X9421 is deselected and the SO pin
is at high impedance, and (unless an internal write cycle is
underway) the device will be in the standby state. CS LOW
enables the X9421, 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.
HOLD (HOLD)
HOLD is used in conjunction with the CS pin to select the
device. Once the part is selected and a serial sequence is
underway, HOLD may be used to pause the serial
communication with the controller without resetting the serial
sequence. To pause, HOLD must be brought LOW while
SCK is LOW. To resume communication, HOLD is brought
HIGH, again while SCK is LOW. If the pause feature is not
used, HOLD should be held HIGH at all times.
4
FN8196.4
January 14, 2009