HV2803SLASHAHA datasheet(17/32 Pages) MICROCHIP

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 2017-2019 Microchip Technology Inc.

DS20005721C-page 17

HV2803/HV2903/HV2904

5.2

Individual Switching Mode and

Bank Switching Mode

The HV2803/HV2903/HV2904 devices have two logic

circuitries that support two Switching modes deter-

mined by the MODE pin logic input. One mode is the

Individual Switching mode and the other mode is the

Bank Switching mode. When the MODE pin is high, the

devices operate in the Individual Switching mode and

can control 32-channel SPST switches individually

through a digital serial interface. When the MODE pin

is low, the devices operate in the Bank Switching mode,

which works as a 16PDT switch for probe selection.

Table 5-1 shows the functional difference of the logic

pins in the two modes. When the MODE input is

changed from low to high, all the shift registers are

reset to zero.

TABLE 5-1:

LOGIC PINS AT INDIVIDUAL SWITCHING VS. BANK SWITCHING

Pin Name

Individual Switching Mode (MODE = H)

Bank Switching Mode (MODE = L)

Function

Description

Function

Description

STBY

L = Standby mode (default)

H = Normal operation

STBY

L = Standby mode (default)

H = Normal operation

DIN/AB

DIN

Data in logic input

A/B

Logic input to select on bank

H = Even SWs on and Odd SWs off

L = Even SWs off and Odd SWs on

LE/EN

Latch enable logic input

Logic input for enable/disable bank switching

H = Enable

L = Disable (all SWs off)

CLR

Latch clear logic input

GND

Should connect to GND

CLK

Clock logic input for shift register

GND

Should connect to GND

DOUT

Data out logic output

high-Z

High-Impedance

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