TEA5767HN Просмотр технического описания (PDF) - Philips Electronics

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TEA5767HN

Low-power FM stereo radio for handheld applications

Philips Electronics 

Philips Semiconductors

TEA5767HN

Low-power FM stereo radio for handheld applications

8. I2C-bus, 3-wire bus and bus-controlled functions

8.1 I2C-bus specification

Information about the I2C-bus can be found in the brochure “The I2C-bus and how to use

it” (order number 9398 393 40011).

The standard I2C-bus specification is expanded by the following definitions:

IC address: 110 0000b

Structure of the I2C-bus logic: slave transceiver

Subaddresses are not used

The maximum LOW-level input and the minimum HIGH-level input are specified to

0.2VCCD and 0.45VCCD respectively.

The pin BUSMODE must be connected to ground to operate the IC with the I2C-bus.

Remark: The I2C-bus operates at a maximum clock frequency of 400 kHz. It is not

allowed to connect the IC to an I2C-bus operating at a higher clock rate.

8.1.1 Data transfer

Data sequence: address, byte 1, byte 2, byte 3, byte 4 and byte 5 (the data transfer has to

be in this order). The LSB = 0 of the address indicates a WRITE operation to the

TEA5767HN.

Bit 7 of each byte is considered as the MSB and has to be transferred as the first bit of the

byte.

The data becomes valid bitwise at the appropriate falling edge of the clock. A STOP

condition after any byte can shorten transmission times.

When writing to the transceiver by using the STOP condition before completion of the

whole transfer:

• The remaining bytes will contain the old information

• If the transfer of a byte is not completed, the new bits will be used, but a new tuning

cycle will not be started

The IC can be switched into a low current Standby mode with the standby bit; the bus is

then still active. The standby current can be reduced by deactivating the bus interface

(pin BUSENABLE LOW). If the bus interface is deactivated (pin BUSENABLE LOW)

without the Standby mode being programmed, the IC maintains normal operation, but is

isolated from the bus lines.

The software programmable output (SWPORT1) can be programmed to operate as a

tuning indicator output. As long as the IC has not completed a tuning action,

pin SWPORT1 remains LOW. The pin becomes HIGH, when a preset or search tuning is

completed or when a band limit is reached.

The reference frequency divider of the synthesizer PLL is changed when the MSB in

byte 5 is set to logic 1. The tuning system can then be clocked via pin XTAL2 at 6.5 MHz.

TEA5767HN_4

Product data sheet

Rev. 04 — 20 February 2006

© Koninklijke Philips Electronics N.V. 2006. All rights reserved.

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