Initialize The Tea5880Ts; Timing Diagrams - Philips TEA5880TS Manual

Philips Semiconductors

8.6 Initialize the TEA5880TS

9. Timing diagrams

R/W
CLOCK
1
DATA LSB
Fig 5. Writing data.
9397 750 13022
Preliminary data sheet
The IF and stereo decoder frequency can be calculated using the equation f = n/t, and the
FM frequency can be calculated using the equation f = (n/t) x 256.
Note: The precision of 'f' depends on the following:
•
The duration of t. 1 pulse wrong at t = 1 ms results in more deviation than at t = 32 ms
•
The precision of the measuring window: calculate with t = 32 ms gives other 'f' values
than with t = 32 ms. In the application care should be taken to have an accurate
measuring window t.
After power-up, the TEA5880TS needs to be initialized as follows:
•
Control register A: STE_PMUTE = 1; DEM_PMUTE = 1; AMUTE = 1; FM = 1; other
bits = 0
•
Control register B: CNT_RST = 1; PISO_CLR = 1; MONO = 1; DEEMP = 1 (for
Europe); Bit [8:6] = 100b; other bits = 0
•
Control register C: All bits = 0
•
VADC register: VADC1 = 26 (decimal), this value should not be changed hereafter;
VADC2 = 18 (decimal), this value should not be changed hereafter
•
Calibrate the IF frequency at 110 kHz
•
Calibrate the stereo decoder clock at 37.5 kHz (to reduce the initialization time,
calibration of the stereo decoder clock can be postponed until the stereo mode is
selected).
11-bit data
Integrated FM stereo radio IC for host processor tuning
Rev. 02 — 26 April 2004
TEA5880TS
11 15
MSB LSB MSB
4-bit address
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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