X9511W 查看數據表（PDF） - Renesas Electronics
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X9511W Datasheet PDF : 9 Pages
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X9511
PIN DESCRIPTIONS
VH/RH and VL/RL
The high (VH/RH) and low (VL/RL) terminals of the
X9511 are equivalent to the fixed terminals of a mechan-
ical potentiometer. The minimum voltage is -5V and the
maximum is +5V. It should be noted that the terminology
of VL/RL and VH/RH are in reference to the relative posi-
tion of the terminal in relation to wiper movement direc-
tion selected by the PU and PD inputs, and not the
voltage potential on the terminal.
PU
The debounced PU input is for incrementing the wiper
position. An on-chip pull-up holds the PU input HIGH. A
switch closure to ground or a LOW logic level will, after a
debounce time, move the wiper to the next adjacent
higher tap position.
PD
The debounced PD input is for decrementing the wiper
position. An on-chip pull-up holds the PD input HIGH. A
switch closure to ground or a LOW logic level will, after a
debounce time, move the wiper to the next adjacent
lower tap position.
ASE
The debounced ASE (AUTOSTORE enable) pin can be
in one of two states:
VIL - AUTOSTORE is enabled. When VCC powers
down, an automatic store cycle takes place.
VIH - AUTOSTORE is disabled. A LOW to HIGH will initi-
ate a manual store operation. This is for the user who
wishes to connect a push button switch to this pin. For
every valid push, the X9511 will store the current wiper
position to the EEPROM.
PIN CONFIGURATION
DIP/SOIC
PU 1
8
VCC
PD 2
7 ASE
X9511
VH
3
6
VL
VSS
4
5
VW
PIN NAMES
SYMBOL
VH/RH
VW/RW
VL/RL
VSS
VCC
PU
PD
ASE
DESCRIPTION
High Terminal
Wiper Terminal
Low Terminal
Ground
Supply Voltage
Push Up Input
Push Down Input
AUTOSTORE Enable Input
DEVICE OPERATION
There are three sections of the X9511: the input control,
counter and decode section; the EEPROM memory; and
the resistor array. The input control section operates just
like an up/down counter. The output of this counter is
decoded to turn on a single electronic switch, connecting
a point on the resistor array to the wiper output. Under the
proper conditions the contents of the counter can be
stored in EEPROM memory and retained for future use.
The resistor array is comprised of 31 individual resistors
connected in series. At either end of the array and
between each resistor is an electronic switch that trans-
fers the potential at that point to the wiper.
The X9511 is designed to interface directly to two push
button switches for effectively moving the wiper up or
down. The PU and PD inputs increment or decrement a
5-bit counter respectively. The output of this counter is
decoded to select one of the thirty-two wiper positions
along the resistive array. The wiper increment input, PU
and the wiper decrement input, PD are both connected
to an internal pull-up so that they normally remain HIGH.
When pulled LOW by an external push button switch or
a logic LOW level input, the wiper will be switched to the
next adjacent tap position.
Internal debounce circuitry prevents inadvertent switch-
ing of the wiper position if PU or PD remain LOW for less
than 40ms, typical. Each of the buttons can be pushed
either once for a single increment/decrement or continu-
ously for a multiple increments/decrements. The number
of increments/decrements of the wiper position depend
on how long the button is being pushed. When making a
continuous push, after the first second, the incre-
ment/decrement speed increases. For the first second
the device will be in the slow scan mode. Then if the but-
ton is held for longer than 1 second the device will go
into the fast scan mode. As soon as the button is
released the X9511 will return to a standby condition.
FN8205 Rev 3.00
February 2, 2007
Page 3 of 9
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