PSB4595 Просмотр технического описания (PDF) - Siemens AG

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PSB4595

Analog Line Interface Solution ALIS

Siemens AG 

PSB 4595 / PSB 4596

Analog Line Interface Solution

Configuration Overview

- Two transistors (T1, T2) to handle the line current. T2 must be of depletion type, in order

to deal with start-up. Recommended transistors: T1: SIEMENS BSP 88; T2: SIEMENS

BSP 129.

- Components for EMC protection: not shown, as they depend on the board layout.

ALIS-D can optionally be connected to the tip/ring to provide Caller ID functions. The CID

circuit requires two capacitors and four resistors.

5.2 Host Interface

The host interface consists of a serial µ-controller interface and a 16-bit linear data

interface. They are used to connect ALIS either to a µ-controller and or to a data pump.

The two serial interfaces can be accessed on two separate serial ports or in time-

multiplex (MUX) mode on a single serial port.

5.2.1 The µ-Controller Interface

The ALIS internal configuration registers, the auxiliary ports, and the Coefficient RAM

(CRAM) are programmable via the serial µ-controller interface. This interface consists of

four pins:

CS:

Chip select, to enable interface (active low)

DCLK:

Clock, 1 kHz to 1024 kHz

DIN:

Data input

DOUT:

Data output

CS is used to start serial access to the ALIS registers and the Coefficient RAM. Following

a CS falling edge, the first eight bits received at DIN specify the command. Subsequent

data bytes (the number depends on the command) are stored in the selected

configuration registers or the selected part of the CRAM.

Serial interface specification: 8 bit, no parity, no start/stop bit. Every command must

begin with a CS falling edge.

Semiconductor Group

26

Data Sheet 06.98

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