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CAT5401 Fiches technique(PDF) 2 Page - Catalyst Semiconductor

No de pièce CAT5401
Description  Quad Digitally Programmable Potentiometers (DPP™) with 64 Taps and SPI Interface
Download  15 Pages
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Fabricant  CATALYST [Catalyst Semiconductor]
Site Internet  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT5401 Fiches technique(HTML) 2 Page - Catalyst Semiconductor

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CAT5401
Doc. No. MD-2012 Rev. G
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
PIN DESCRIPTIONS
SI: Serial Input
SI is the serial data input pin. This pin is used to input all
opcodes, byte addresses and data to be written to the
CAT5401. Input data is latched on the rising edge of the
serial clock.
SO: Serial Output
SO is the serial data output pin. This pin is used to
transfer data out of the CAT5401. During a read cycle,
data is shifted out on the falling edge of the serial
clock.
SCK: Serial Clock
SCK is the serial clock pin. This pin is used to
synchronize
the
communication
between
the
microcontroller and the CAT5401. Opcodes, byte
addresses or data present on the SI pin are latched on
the rising edge of the SCK. Data on the SO pin is
updated on the falling edge of the SCK.
A0, A1: Device Address Inputs
These inputs set the device address when addressing
multiple devices. A total of four devices can be
addressed on a single bus. A match in the slave
address must be made with the address input in order
to initiate communication with the CAT5401.
RH, RL: Resistor End Points
The four sets of RH and RL pins are equivalent to the
terminal connections on a mechanical potentiometer.
RW: Wiper
The four RW pins are equivalent to the wiper terminal of
a mechanical potentiometer.
CS
¯¯¯: Chip Select
CS
¯¯¯ is the Chip select pin. CS
¯¯¯ low enables the
CAT5401 and CS
¯¯¯ high disables the CAT5401. CS
¯¯¯
high takes the SO output pin to high impedance and
forces the devices into a Standby mode (unless an
internal write operation is underway). The CAT5401
draws ZERO current in the Standby mode. A high to
low transition on CS
¯¯¯ is required prior to any sequence
being initiated. A low to high transition on CS
¯¯¯ after a
valid write sequence is what initiates an internal write
cycle.
WP
¯¯¯: Write Protect
WP
¯¯¯ is the Write Protect pin. The Write Protect pin will allow normal read/write operations when held high. When
WP
¯¯¯ is tied low, all non-volatile write operations to the Data registers are inhibited (change of wiper control register
is allowed). WP
¯¯¯ going low while CS
¯¯¯ is still low will interrupt a write to the registers. If the internal write cycle has
already been initiated, WP
¯¯¯ going low will have no effect on any write operation.
HOLD
¯¯¯¯¯: Hold
The HOLD
¯¯¯¯¯ pin is used to pause transmission to the CAT5401 while in the middle of a serial sequence without
having to retransmit entire sequence at a later time. To pause, HOLD
¯¯¯¯¯ must be brought low while SCK is low. The
SO pin is in a high impedance state during the time the part is paused, and transitions on the SI pins will be
ignored. To resume communication, HOLD
¯¯¯¯¯ is brought high, while SCK is low. (HOLD
¯¯¯¯¯ should be held high any
time this function is not being used.) HOLD
¯¯¯¯¯ may be tied high directly to VCC or tied to VCC through a resistor.
Pin#
(SOIC)
Pin#
(TSSOP) Name Function
1
19
VCC
Supply Voltage
2
20
RL0
Low Reference Terminal
for Potentiometer 0
3
21
RH0
High Reference Terminal
for Potentiometer 0
4
22
RW0
Wiper Terminal for
Potentiometer 0
5
23
CS
¯¯¯
Chip Select
6
24
WP
¯¯¯
Write Protection
7
1
SI
Serial Input
8
2
A1
Device Address
9
3
RL1
Low Reference Terminal
for Potentiometer 1
10
4
RH1
High Reference Terminal
for Potentiometer 1
11
5
RW1
Wiper Terminal for
Potentiometer 1
12
6
GND
Ground
13
7
NC
No Connect
14
8
RW2
Wiper Terminal for
Potentiometer 2
15
9
RH2
High Reference Terminal
for Potentiometer 2
16
10
RL2
Low Reference Terminal
for Potentiometer 2
17
11
SCK
Bus Serial Clock
18
12
HOLD
¯¯¯¯¯ Hold
19
13
SO
Serial Data Output
20
14
A0
Device Address, LSB
21
15
RW3
Wiper Terminal for
Potentiometer 3
22
16
RH3
High Reference Terminal
for Potentiometer 3
23
17
RL3
Low Reference Terminal
for Potentiometer 3
24
18
NC
No Connect


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