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TEA5767HN Datasheet

  • TEA5767HN

  • Low-power FM stereo radio

  • Philips

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Philips Semiconductors
TEA5767HN
Low-power FM stereo radio for handheld applications
A negative edge at pin WRITE/READ enables the data transfer from the IC. The
WRITE/READ pin changes while the clock is LOW. With the negative edge at
pin WRITE/READ the MSB of the 鏗乺st byte occurs at pin DATA.
The bits are shifted on the negative clock edge to pin DATA and can be read on the
positive edge.
To do two consecutive read or write actions, pin WRITE/READ has to be toggled for at
least one clock period. When a search tuning request is sent, the IC autonomously starts
searching the FM band; the search direction and search stop level can be selected. When
a station with a 鏗乪ld strength equal to or greater than the stop level is found, the tuning
system stops and the ready 鏗俛g bit is set to HIGH. When, during search, a band limit is
reached, the tuning system stops at the band limit and the band limit 鏗俛g bit is set to
HIGH. The ready 鏗俛g is also set to HIGH in this case.
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.
8.3.2 Power-on reset
At Power-on reset the mute is set, all other bits are random. To initialize the IC all bytes
have to be transferred.
8.4 Writing data
WRITE_READ
t
W(write)
50 %
t
su(clk)
CLOCK
50 %
50 %
t
h(write)
t
su(write)
valid data
mhc250
DATA
50 %
Fig 7. 3-wire bus write data
DATA BYTE 1
DATA BYTE 2
DATA BYTE 3
DATA BYTE 4
DATA BYTE 5
001aae350
Fig 8. Write mode
TEA5767HN_4
漏 Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 04 鈥?20 February 2006
13 of 39

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