CAT5261YI00 View Datasheet(PDF) - ON Semiconductor

Part Name

Description

MFG CO.

CAT5261YI00

Dual Digital Potentiometer (POT) with 256 Taps and SPI Interface

ON Semiconductor 

CAT5261

SERIAL BUS PROTOCOL

The CAT5261 supports the SPI bus data transmission

protocol. The synchronous Serial Peripheral Interface (SPI)

helps the CAT5261 to interface directly with many of

today’s popular microcontrollers. The CAT5261 contains an

8-bit instruction register. The instruction set and the

operation codes are detailed in the Instruction Set Table 13

on page 9.

DEVICE OPERATION

The CAT5261 is two resistor arrays integrated with an SPI

serial interface logic, two 8-bit wiper control registers and

eight 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 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.

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 allows 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.

Table 2. ABSOLUTE MAXIMUM RATINGS

Parameters

Ratings

Units

Temperature Under Bias

−55 to +125

°C

Storage Temperature

−65 to +150

°C

Voltage on Any Pin with Respect to Ground (Note 1)

VCC with Respect to Ground

Package Power Dissipation Capability (TA = 25°C)

Lead Soldering Temperature (10 s)

−2.0 to +VCC + 2.0

V

−0.2 to +7.0

V

1.0

W

300

°C

Wiper Current

±6

mA

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality

should not be assumed, damage may occur and reliability may be affected.

Table 3. RECOMMENDED OPERATING CONDITIONS

Parameters

Ratings

Units

VCC

Industrial Temperature

+2.5 to +6.0

V

−40 to +85

°C

Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond

the Recommended Operating Ranges limits may affect device reliability.

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