ISL22426UFV14Z-TK Intersil, ISL22426UFV14Z-TK Datasheet - Page 13

• Manufacturer Part Number: ISL22426UFV14Z-TK
• Description: IC POT DGTL 128TP LN LP 14-TSSOP
• Manufacturer: Intersil
• Series: XDCP™r

Specifications of ISL22426UFV14Z-TK

• Taps: 128
• Resistance (ohms): 50K
• Number Of Circuits: 2
• Temperature Coefficient: 80 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP
• Resistance In Ohms: 50K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Applications Information
Communicating with ISL22426
Communication with ISL22426 proceeds using SPI interface
through the ACR (address 1000b), IVRi (addresses 0000b,
0001b) and WRi (addresses 0000b, 0001b) registers.
The wiper of the potentiometer is controlled by the WRi
register. Writes and reads can be made directly to these
registers to control and monitor the wiper position without
any non-volatile memory changes. This is done by setting
MSB bit at address 1000b to 1.
The non-volatile IVRi stores the power up value of the wiper.
IVRs are accessible when MSB bit at address 1000b is set
to 0. Writing a new value to the IVRi register will set a new
power-up position for the wiper. Also, writing to this register
will load the same value into the corresponding WRi as the
IVRi. Reading from the IVRi will not change the WRi, if its
contents are different.
Examples
A. Writing to the IVR
This sequence will write a new value (77h) to the IVR0
(non-volatile):
Set the ACR (Addr 1000b) for NV write (40h)
Send the ID byte, Instruction Byte, then the Data byte
Set the IVR0 (Addr 0000b) to 77h
Send the ID byte, Instruction Byte, then the Data byte
0 1 0 1 0 0 0 0 1 1 0 0 1 0 0 0 0 1 0 0 0 0 0 0
0 1 0 1 0 0 0 0 1 1 0 0 0 0 0 0 0 1 1 1 0 1 1 1
13
(Sent to DI)
(Sent to DI)
ISL22426
B. Reading from the WR
This sequence will read the value from the WR1 (volatile):
Write to ACR first to access the WRs
Send the ID byte, Instruction Byte, then the Data byte
Read the data from WR1 (Addr 0001b)
Send the ID byte, Instruction Byte, then Read the Data byte
0 1 0 1 0 0 0 0 1 1 0 0 1 0 0 0 1 1 0 0 0 0 0 0
0 1 0 1 0 0 0 0 1 0 1 1 0 0 0 1 x x x x x x x x
(Sent to DI)
(Out on DO)
September 8, 2009
FN6180.2