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CAT5251 Fiches technique(PDF) 3 Page - Catalyst Semiconductor

No de pièce CAT5251
Description  Quad Digitally Programmable Potentiometer (DPP™) with 256 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

CAT5251 Fiches technique(HTML) 3 Page - Catalyst Semiconductor

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CAT5251
© Catalyst Semiconductor, Inc.
3
Doc. No. MD-2017 Rev. F
Characteristics subject to change without notice
SERIAL BUS PROTOCOL
The
CAT5251
supports
the
SPI
bus
data
transmission protocol. The synchronous Serial
Peripheral Interface (SPI) helps the CAT5251 to
interface directly with many of today's popular
microcontrollers. The CAT5251 contains an 8-bit
instruction register. The instruction set and the
operation codes are detailed in Table 3, Instruction
Set on page 8.
After the device is selected with CS
¯¯¯ going low the
first byte will be received. The part is accessed via
the SI pin, with data being clocked in on the rising
edge of SCK. The first byte contains one of the six
op-codes that define the operation to be performed.
DEVICE OPERATION
The CAT5251 is four resistor arrays integrated with an
SPI serial interface logic, four 8-bit wiper control
registers and sixteen 8-bit, non-volatile memory data
registers. Each resistor array contains 255 separate
resistive elements connected in series. The physical
ends of each array are equivalent to the fixed terminals
of a mechanical potentiometer (RH and RL). RH and RL
are symmetrical and may be interchanged. The tap
positions between and at the ends of the series
resistors are connected to the output wiper terminals
(RW) by a CMOS transistor switch. Only one tap point
for each potentiometer is connected to its wiper terminal
at a time and is determined by the value of the wiper
control register. Data can be read or written to the wiper
control registers or the non-volatile memory data
registers via the SPI bus. Additional instructions allow
data to be transferred between the wiper control
registers and each respective potentiometer's non-
volatile data registers. Also, the device can be
instructed to operate in an "increment/decrement"
mode.
ABSOLUTE MAXIMUM RATINGS (1)
Parameter
Ratings
Units
Temperature Under Bias
-55 to +125
°C
Storage Temperature
-65 to +150
°C
Voltage on any Pin with Respect to VSS
(2)(3)
-2.0 to +VCC +2.0
V
VCC with Respect to Ground
-2.0 to +7.0
V
Package Power Dissipation Capability (TA = 25°C)
1.0
W
Lead Soldering Temperature (10 secs)
300
°C
Wiper Current
±6
mA
Recommended Operating Conditions
VCC = +2.5V to +6V
Notes:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
(2) The minimum DC input voltage is –0.5V. During transitions, inputs may undershoot to –2.0V for periods of less than 20ns. Maximum DC
voltage on output pins is VCC +0.5V, which may overshoot to VCC +2.0V for periods of less than 20ns.
(3) Latch-up protection is provided for stresses up to 100mA on address and data pins from –1V to VCC + 1V.
Parameter
Ratings
Units
Operating Ambient Temperature (Industrial)
-40 to +85
°C


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