Datenblatt-Suchmaschine für elektronische Bauteile |
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3X8292 Datenblatt(PDF) 7 Page - List of Unclassifed Manufacturers |
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3X8292 Datenblatt(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 14 page 3X8168 ED Page: 7/14 November 02 8168ED01.DOC 8. I²C bus There are two different I²C bus used one I²C Tuner to control tuning and one I²C IF to control IF demodulation and baseband processing. With port P0 of control byte 2 the slave address of I 2C IF can be controlled. 8.1 I²C Tuner 8.1.1 Write data format MSB LSB Address byte 1 1 0 0 0 MA1 MA0 R/W A Divider byte 1 0 n14 n13 n12 n11 n10 n9 n8 A Divider byte 2 n7 n6 n5 n4 n3 n2 n1 n0 A Control byte 1 1 CP T2 T1 T0 RSA RSB OS A Control byte 2 P7 P6 P5 P4 P3 P2 P1 P0 A A = Acknowledge R/W = 0 : Write mode CP = 1 : charge pump current high T2, T1, T0 = test bits, normal operation: T2 = 0, T1 = 0, T0 = 1 RSA, RSB bits for minimum step size, see 8.1.2 OS = tuning voltage switch, normal operation: OS = 0 8.1.2 Address selection MA1 MA0 Address Voltage at Pin 11 0 0 C0 ( 0 to 0.1 ) * VS1 0 1 C2 (0.2 to 0.3) * VS1 or open 1 0 C4 ( 0.4 to 0.6 ) * VS1 1 1 C6 ( 0.9 to 1 ) * VS1 8.1.3 Oscillator frequency and divider byte calculation: RSA RSB Reference divider Min. tuning step [kHz] fref [kHz] 1 1 512 62.5 7.8125 X 0 640 50.0 6.25 0 1 1024 31.25 3.90625 for FM recption we recommend 50 kHz minimum step size fOSC= fD + fIF fIF = 38.9 MHz at B/G, D/K, I, L fIF = 33.9 MHz at L’ fIF = 33.3 MHz at FM fOSC : Local oscillator frequency fD : Desired frequency fOSC = fREF * 8 * SF fREF : Crystal reference frequency / 640 = 4 MHz / 640 = 6.25 kHz, ( RSA =X, RSB = 0) SF : Programmable scaling factor Scaling factor SF= 16384* n14 + 8192 * n13 * 4096 * n12 + 2048 * n11 + 1024 * n10 + 512 * n9 + 256* n8 + 128 * n7 + 64 * n6 + 32 * n5 + 16 * n4 + 8 * n3 + 4 * n2 + 2 * n1 + n0 |
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Ähnliche Beschreibung - 3X8292 |
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