X9420WV14I-2.7 Intersil, X9420WV14I-2.7 Datasheet - Page 6

• Manufacturer Part Number: X9420WV14I-2.7
• Description: IC DIGITAL POT 10K 64TP 14TSSOP
• Manufacturer: Intersil
• Series: XDCP™r

Specifications of X9420WV14I-2.7

• Taps: 64
• Resistance (ohms): 10K
• Number Of Circuits: 1
• Temperature Coefficient: 300 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP
• Resistance In Ohms: 10K
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The four high order bits of the instruction byte specify
the operation. The next two bits (R
one of the four registers that is to be acted upon when
a register oriented instruction is issued. The last two
bits are defined as 0.
Two of the eight instructions are two bytes in length
and end with the transmission of the instruction byte.
These instructions are:
– XFR Data Register to Wiper Counter Register —
– XFR Wiper Counter Register to Data Register—This
The basic sequence of the two byte instructions is
illustrated in Figure 4. These two-byte instructions
exchange data between the WCR and one of the Data
Registers. A transfer from a Data Register to a WCR is
essentially a write to a static RAM, with the static RAM
controlling the wiper position. The response of the wiper
to this action will be delayed by t
the WCR (current wiper position), to a Data Register is
a write to nonvolatile memory and takes a minimum of
t
potentiometer and one of its associated registers.
Figure 4. Two-Byte Instruction Sequence
WR
This instruction transfers the contents of one speci-
fied Data Register to the Wiper Counter Register.
instruction transfers the contents of the Wiper
Counter Register to the specified associated Data
Register.
to complete. The transfer can occur between the
SCK
CS
SI
6
0
WRL
1
1
0
. A transfer from
and R
1
1
0
) select
1
0
X9420
A0
I3
Five instructions require a three-byte sequence to
complete. These instructions transfer data between
the host and the X9420; either between the host and
one of the Data Registers or directly between the host
and the WCR. These instructions are:
– Read Wiper Counter Register—read the current
– Write Wiper Counter Register—change current
– Read Data Register—read the contents of the
– Write Data Register—write a new value to the
– Read Status—This command returns the contents
The sequence of these operations is shown in Figure
5 and Figure 6.
The final command is Increment/Decrement. It is
different from the other commands, because it’s length
is indeterminate. Once the command is issued, the
master can clock the wiper up and/or down in one
resistor segment steps; thereby, providing a fine
tuning capability to the host. For each SCK clock pulse
(t
one resistor segment towards the V
Similarly, for each SCK clock pulse while SI is LOW,
the selected wiper will move one resistor segment
towards the V
the sequence and timing for this operation are shown
in Figure 7 and Figure 8.
HIGH
wiper position of the pot,
wiper position of the pot,
selected data register;
selected data register.
of the WIP bit which indicates if the internal write
cycle is in progress.
I2
) while SI is HIGH, the selected wiper will move
I1
I0
L
R1 R0
/R
L
terminal. A detailed illustration of
0
0
H
/R
H
terminal.
April 26, 2006
FN8195.1