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PDF WMS7204 Data sheet ( Hoja de datos )
| Número de pieza | WMS7204 | |
| Descripción | 256-TAP QUAD-CHANNEL NON-VOLATILE DIGITAL POTENTIOMETER | |
| Fabricantes | Winbond | |
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PRELIMINARY
WMS7204
256-TAP QUAD-CHANNEL NON-VOLATILE DIGITAL
POTENTIOMETER
Publication Release Date: January 2003
- 1 - Revision 1.0
1 page  
5. PIN CONFIGURATION
WMS7204
CS
CLK
SDI
WP
VSS
R/B
VA4
VW4
VB4
VB3
1
2
3
4
5
6
7
8
9
10
20 VDD
19 SDO
18 VA1
17 VW1
16 VB1
15 VB2
14 VW2
13 VA2
12 VA3
11 VW3
20 - PDIP
20 19 18 17 16 15 14 13 12 11
20 19 18 17 16 15 14 13 12 11
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
20 - SOIC
20 - TSSOP
Publication Release Date: January 2003
- 5 - Revision 1.0
5 Page 
WMS7204
7.6. SERIAL DATA INTERFACE
The WMS7204 contains a four-wire SPI interface:
• SDO (Serial Data Output) Used for reading out the internal register contents and for daisy
chaining multiple devices.
• SDI (Serial Data Input) Used for clocking in commands and potentiometer settings.
• CS (Chip Select) This pin must be pulled LOW before starting to send a command and pulled
HIGH to signal the end of the command. This pin can be used to control multiple devices on
the bus.
• CLK (Clock) The SDI bits are shifted in on the rising edge of the clock and SDO data is
shifted out on the falling edge of the clock.
The key features of this interface include:
• Independently programmable Read & Write to all registers
• Direct parallel refresh of all Tap registers from corresponding internal NVMEM registers
• Increment and decrement instruction for each Tap register
• Nonvolatile storage of the present Tap register values into one of the four NVMEM registers
available to each channel
• Configurable output buffer amplifier to allow both the functions of a potentiometer and a
variable resistor
• Four 9-bit non-volatile registers store four preset wiper positions and the first one will be
recalled to set the wiper position during power up.
The serial interface uses an SPI compatible uniform 24-bit word format as shown below. This format is
used for all members of the WMS720x family. The data is sent MSB first.
TABLE 2 – 24-BIT DATA WORD FORMAT
MSB
LSB
C3 C2 C1 C0 A3 A2 A1 A0 X X X X X X X D8 D7 D6 D5 D4 D3 D2 D1 D0
C3-C0 are the command bits that control the operation of the digital potentiometer according to the
command instructions shown in the Instruction Set in Table 5 in Section 7.7.
A1 and A0 are the address bits that determine which channel is activated, as shown in the table
below.
- 11 -
Publication Release Date: January 2003
Revision 1.0
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WMS7204.PDF ] | |
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