ISL23315_15 Datasheet, PDF (13/20 Pages) Intersil Corporation – Single, Low Voltage Digitally Controlled Potentiometer(XDCP™)

ISL23315
Typical Performance Curves (Continued)
1V/DIV
1µs/DIV
WIPER
1V/DIV
0.1s/DIV
SCL 9TH CLOCK OF THE
DATA BYTE (ACK)
FIGURE 21. WIPER LARGE SIGNAL SETTLING TIME
FIGURE 22. POWER-ON START-UP IN VOLTAGE DIVIDER MODE
CH1: 0.5V/DIV, 0.2µs/DIV RH PIN
CH2: 0.2V/DIV, 0.2µs/DIV RW PIN
R_TOTAL = 10k
-3dB FREQUENCY = 1.4MHz AT MIDDLE TAP
FIGURE 23. 10k -3dB CUT OFF FREQUENCY
1.2
1.0
0.8
V_CC = 5.5V, V_LOGIC = 5.5V
0.6
0.4
V_CC = 1.7V, V_LOGIC = 1.2V
0.2
0
-40
-15
10
35
60
85
110
TEMPERATURE (°C)
FIGURE 24. STANDBY CURRENT vs TEMPERATURE
Functional Pin Descriptions
Potentiometers Pins
RH AND RL
The high (R_H) and low (R_L) terminals of the ISL23315 are
equivalent to the fixed terminals of a mechanical potentiometer.
R_H and R_L are referenced to the relative position of the wiper and
not the voltage potential on the terminals. With WR set to 255
decimal, the wiper will be closest to R_H, and with the WR set to 0,
the wiper is closest to R_L.
RW
RW is the wiper terminal, and it is equivalent to the movable
terminal of a mechanical potentiometer. The position of the
wiper within the array is determined by the WR register.
Bus Interface Pins
SERIAL DATA INPUT/OUTPUT (SDA)
The SDA is a bidirectional serial data input/output pin for I²C
interface. It receives device address, operation code, wiper
address and data from an I²C external master device at the
rising edge of the serial clock SCL, and it shifts out data after
each falling edge of the serial clock.
SDA requires an external pull-up resistor, since it is an open drain
input/output.
SERIAL CLOCK (SCL)
This input is the serial clock of the I²C serial interface. SCL
requires an external pull-up resistor, since a master is an open
drain output.
13
FN7778.2
August 12, 2015