|
Details, datasheet, quote on part number:WMS7120050S
| |
Datasheet text preview:
PRELIMINARY DATASHEET
WMS7120 / 7121
NON-VOLATILE DIGITAL POTENTIOMETERS WITH UP/DOWN (3-WIRE) INTERFACE, 10KOHM, 50KOHM, 100KOHM RESISTANCE 64 TAPS WITHOUT / WITH OUTPUT BUFFER
-1-
Publication Release Date: July 2003 Revision 1.0
WMS7120 / 7121
1. GENERAL DESCRIPTION
The WMS7120/7121 is a single channel 64-tap non-volatile linear digital potentiometer available in 10K, 50K and 100K resistance. The device consists of Up/Down serial interface, tap register, decoder, resistor array, wiper switches, NV memory and control logics. The WMS7120 device can be configured as a two-terminal variable resistor or a three-terminal voltage divider without an output buffer, but the WMS7121 device, which has a built-in output buffer, can only be configured as a three-terminal voltage divider. Both devices can be used in a wide variety of applications. The output of the potentiometer is determined by its wiper position, which varies linearly between its end terminals, RA/VA and RB/VB. The wiper position, Rw/Vw, is controlled by Up/Down serial interface ( CS , INC and U/ D ) through the Tap Register (TR). In addition, the wiper position can also be stored into a non-volatile memory location (NVMEM0), which is then automatically recalled upon power up.
2. FEATURES
· · · · · · · · · · · · Drop-in replacement for many popular parts Single linear-taper channel 64 taps 10K, 50K and 100K end-to-end resistance VSS to VDD terminal voltages Automatic recall of wiper position when power-on Potentiometer control through Up/Down (3-wire) serial interface Endurance 100,000 cycles Data retention 100 years Package options: 8-pin PDIP, SOIC or MSOP Industrial temperature range: -40° to 85°C Single supply operation : 2.7V to 5.5V
-2-
WMS7120 / 7121
3. BLOCK DIAGRAM
Tap Register
RA/VA
INC CS U/D
Decoder
Up/Down Serial Interface
RW /VW
RB/VB
NV Memory
VSS
NV Memory Control
NVMEM0
VDD
FIGURE 1 WMS7120 BLOCK DIAGRAM (Rheostat/Divider Mode)
Tap Register
VA
INC CS U/D
Up/Down Serial Interface
Decoder
VW
VB
NV Memory
VSS
NV Memory Control
NVMEM0
VDD
FIGURE 2 WMS7121 BLOCK DIAGRAM (Divider Mode)
-3-
Publication Release Date: July 2003 Revision 1.0
|
|
