UBA1706TS Просмотр технического описания (PDF) - Philips Electronics

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производитель

UBA1706TS

Cordless telephone line interface

Philips Electronics 

Philips Semiconductors

Cordless telephone line interface

Objective specification

UBA1706

General purpose switches (pins SWI1 and SWI2; bits

SWC1 and SWC2)

The UBA1706 is equipped with two general purpose

open-collector switches, which short circuit pins SWI1 and

SWI2 to ground. These switches are controlled by bits

SWC1 and SWC2, respectively, and have an operating

voltage limited to 12 V. The outputs have to be current

biased. For a bias current between 2 and 20 mA, the

AC impedance is 30 Ω maximum.

Serial interface (pins DATA, CLK and EN)

A simple 3-wire unidirectional serial bus is used to program

the circuit. The three wires of the bus are EN, CLK and

DATA. The data sent to the device is loaded in bursts

framed by EN. Programming clock edges (falling edges)

and their appropriate data bits are ignored until EN goes

HIGH. The programmed information is loaded into the

addressed register when EN returns to LOW or left

open-circuit.

During normal operation, EN should be kept LOW. Only

the last seven bits serially clocked into the device are

retained within the programming register.

Additional leading bits are ignored and no check is made

on the number of clock pulses. New programming data can

always be captured during global power-down (bit PD at

logic 1).

Data is entered with the most significant bit first. The

leading six bits make up the data field (bits D0 to D5) while

the trailing two bits are the address field (bits ADO and

AD1). The first bit entered is D5, the last bit AD0. This

organisation allows the transmission of only the number of

bits of the addressed register.

Figure 13 shows the serial timing diagram. Table 1 gives

the list of registers.

When the supply voltage VCC drops below 2.5 V, all

register files are set to the initial state (see Table 1)

defined by the power-up reset. At start-up, the circuit is in

power-down mode.

When the IC is used in a noisy environment, it is advised

to periodically refresh the content of registers.

1999 Jun 04

14

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