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WMS7202050P

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
WMS7202
- 4 -
4. TABLE OF CONTENTS
1. GENERAL DESCRIPTION.................................................................................................................. 2
2. FEATURES ......................................................................................................................................... 2
3. BLOCK DIAGRAM .............................................................................................................................. 3
4. TABLE OF CONTENTS ...................................................................................................................... 4
5. PIN CONFIGURATION ....................................................................................................................... 5
6. PIN DESCRIPTION............................................................................................................................. 6
7. FUNCTIONAL DESCRIPTION............................................................................................................ 7
7.1. Potentiometer and Rheostat Modes ............................................................................................. 7
7.1.1. Rheostat Configuration .......................................................................................................... 7
7.1.2. Potentiometer Configuration .................................................................................................. 7
7.2. Programming Modes .................................................................................................................... 7
7.3. Non-Volatile Memory (NVMEM) ................................................................................................... 8
7.3.1 Write Protect of NVMEM ......................................................................................................... 8
7.4 Flow Control................................................................................................................................... 8
7.5. Daisy Chain .................................................................................................................................. 9
7.6. Serial Data Interface ................................................................................................................... 10
7.7. Instruction Set............................................................................................................................. 12
7.8. Basic Operation .......................................................................................................................... 12
7.8.1 Sending a Command ............................................................................................................ 12
7.8.2 Wake Up/Sleep/Power Commands ...................................................................................... 13
7.8.3 Write to Tap Register (TR).................................................................................................... 13
7.8.4 Programming Non-Volatile Memory (NVMEM)..................................................................... 14
7.8.5 Reading Tap Registers and NVMEM Locations ................................................................... 15
8. TIMING DIAGRAMS.......................................................................................................................... 16
9. Absolute Maximum Ratings............................................................................................................... 18
10. ELECTRICAL CHARACTERISTICS ............................................................................................... 19
10.1 Test Circuits............................................................................................................................... 21
11. TYPICAL APPLICATION CIRCUIT.................................................................................................22
11.1. Layout Considerations .............................................................................................................. 25
12. PACKAGE DRAWINGS AND DEMINSIONS.................................................................................. 26
13. ORDERING INFORMATION........................................................................................................... 29
14. VERSION HISTORY ....................................................................................................................... 30
WMS7202
Publication Release Date: January 2003
- 5 - Revision 1.1
5. PIN CONFIGURATION
1
2
3
4
14
13
12
11
6
7
9
8
5
10
CS
CL
K
SDI
WP
V
SS
R/B
VA2
V
DD
SDO
VA1
VW1
VB1
VB2
VW2
14
13
12
11
9
8
12
3
4
6
7
5
10
14 PDIP
14 SOIC 14 TSSOP
V
DD
SDO
VA1
VW1
VB1
VB2
VW2
CS
CL
K
SDI
WP
V
SS
R/B
VA2
14 13 12 11
9
8
12
3
4
6
7
5
10
V
DD
SDO
VA1
VW1
VB1
VB2
VW2
CS
CL
K
SDI
WP
V
SS
R/B
VA2
WMS7202
- 6 -
6. PIN DESCRIPTION
TABLE 1 – PIN DESCRIPTION
PIN NAME PIN NO I/O DESCRIPTION
CLK
2
I
Serial Clock pin. Data Shifts in one bit at a time on positive clock
(CLK) edges
CS
1
I
Chip Select pin. When CS is HIGH, WMS7202 is deselected and
the SDO pin is at high impedance, and (unless an internal write
cycle is underway) the device will be in the standby state. CS LOW
enables WMS7202, 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.
SDI
3
I
Serial Data Input pin. All opcodes, byte addresses and data to be
written to the registers are input on this pin. Data is latched by the
rising edge of the serial clock.
SDO
13
O
Serial Data Output pin with open-drain output. During a read cycle,
data is shifted out on this pin. Data is clocked out by the falling
edge of the serial clock except for the 1
st
bit , which is clocked out
by the falling edge of CS. Also can be used to daisy-chain several
parts.
R/B
6
O
Ready signal with active-LOW, open-drain output, and
acknowledges the completion of commands 2, 4, 5, 6, and 7.
WP
4
I
Hardware Write Protect pin. When active LOW
WP prevents any
changes to the present contents except retrieving NVMEM
contents.
V
DD
14 - Power Supply
V
SS
5
- Ground pin, logic ground reference
VA1
12
-
A terminal of potentiometer ‘1’, equivalent to the HI terminal
connection on a mechanical potentiometer
VB1
10
-
B terminal of potentiometer ‘1’, equivalent to the LO terminal
connection on a mechanical potentiometer
VW1
11
O
Wiper terminal of potentiometer ‘1’, equivalent to the wiper terminal
of a mechanical potentiometer
VA2
7
-
A terminal of potentiometer ‘2’, equivalent to the HI terminal
connection on a mechanical potentiometer.
VB2
9
-
B terminal of potentiometer ‘2’, equivalent to the LO terminal
connection on a mechanical potentiometer.
VW2
8
O
Wiper terminal of potentiometer ‘2’, equivalent to the wiper terminal
of a mechanical potentiometer.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

WMS7202050P

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IC DGTL POT 50KOHM 256TAP 14DIP
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