CAT5411

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4

DEVICE OPERATION

The CAT5411 is two resistor arrays integrated with SPI

serial interface logic, two 6-bit wiper control registers and

eight 6-bit, non-volatile memory data registers. Each resistor

array contains 63 separate resistive elements connected in

series. The physical ends of each array are equivalent to the

positions between and at the ends of the series resistors are

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.

SERIAL BUS PROTOCOL

The CAT5041 supports the SPI bus data transmission

protocol. The synchronous Serial Peripheral Interface (SPI)

helps the CAT5411 to interface directly with many of

today’s popular microcontrollers. The CAT5041 contains an

8-bit instruction register. The instruction set and the

operation codes are detailed in the instruction set Table 12.

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.

Symbol

Parameter

Reference Test Method

Min

Typ

Max

Units

Endurance

MIL−STD−883, Test Method 1033

1,000,000

Cycles/Byte

TDR (Note 1)

Data Retention

MIL−STD−883, Test Method 1008

100

Years

ESD Susceptibility

MIL−STD−883, Test Method 3015

2000

Volts

Latch-up

JEDEC Standard 17

100

mA

1. This parameter is tested initially and after a design or process change that affects the parameter.

Table 3. ABSOLUTE MAXIMUM RATINGS

Parameters

Ratings

Units

Temperature Under Bias

−55 to +125

C

Storage Temperature Range

−65 to +150

C

V

−2.0 to +7.0

V

1.0

W

Lead Soldering Temperature (10 s)

300

C

Wiper Current

12

mA

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

2. The minimum DC input voltage is –0.5 V. During transitions, inputs may undershoot to –2.0 V for periods of less than 20 ns. Maximum DC

Table 4. RECOMMENDED OPERATING CONDITIONS

Parameters

Ratings

Units

+2.5 to 6.0

V

Industrial Temperature

−40 to +85

C