X9111
3
FN8159.5
October 13, 2016
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Bus Interface Pins
SERIAL OUTPUT (SO)
SO is a 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)
SI is the serial data input pin. All opcodes, byte addresses and data
to be written to the pots and pot registers 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 X9111.
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.
DEVICE ADDRESS (A
0
, A
1
)
The address inputs are used to set the 8-bit slave address. A
match in the slave address serial data stream must be made
with the address input (A1–A0) in order to initiate
communication with the X9111.
CHIP SELECT (CS)
When CS is HIGH, the X9111 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
X9111, 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.
HARDWARE WRITE PROTECT INPUT (WP)
The WP pin when LOW prevents nonvolatile writes to the Data
Registers.
Potentiometer Pins
R
H
, R
L
The R
H
and R
L
pins are equivalent to the terminal connections on a
mechanical potentiometer.
R
W
The wiper pin is equivalent to the wiper terminal of a mechanical
potentiometer.
Bias Supply Pins
SYSTEM SUPPLY VOLTAGE (V
CC
) AND SUPPLY
GROUND (V
SS
)
The V
CC
pin is the system supply voltage. The V
SS
pin is the
system ground.
Other Pins
NO CONNECT (NC)
Pin should be left open. This pin is used for Intersil
manufacturing and test purposes.
Pin Configuration
X9111
(14 LD TSSOP)
TOP VIEW
Pin Descriptions
PIN
(TSSOP) SYMBOL FUNCTION
1 SO Serial Data Output
2 A0 Device Address
3 NC No Connect
4CS
Chip Select
5 SCK Serial Clock
6SISerial Data Input
7V
SS
System Ground
8WPHardware Write Protect
9 A1 Device Address
10 HOLD
Device Select. Pause the Serial Bus
11 R
W
Wiper Terminal of the Potentiometer
12 R
H
High Terminal of the Potentiometer
13 R
L
Low Terminal of the Potentiometer
14 V
CC
System Supply Voltage
V
CC
R
L
V
SS
1
2
3
4
5
6
7
8
14
13
12
11
10
9
NC
R
W
CS
A1
R
H
A0
SO
SI
HOLD
SCK
WP
