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STW81103AT Datasheet(PDF) 33 Page - STMicroelectronics |
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STW81103AT Datasheet(HTML) 33 Page - STMicroelectronics |
33 / 53 page STW81103 I2C bus interface 33/53 B_COUNTER B[10:3]. B counter value (bit B11 in the previous register, bits B[2:0] in the next register) A_COUNTER Bits B[2:0] for B_COUNTER, A_COUNTER values. REF_DIVIDER Reference clock divider ratio R[9:1] (bits R1, R0 in the next register). CONTROL The CONTROL register is used to set the charge pump current, the VCO output voltage amplitude and the prescaler modulus: The LO output frequency is programmed by setting the proper values for A, B and R according to the following formula: and P is the selected prescaler modulus. MSB LSB b7 b6 b5 b4 b3 b2 b1 b0 B10 B9B8B7B6B5 B4B3 MSB LSB b7 b6 b5 b4 b3 b2 b1 b0 B2 B1 B0 A4 A3 A2 A1 A0 MSB LSB b7 b6 b5 b4 b3 b2 b1 b0 R9 R8 R7 R6 R5 R4 R3 R2 MSB LSB b7 b6 b5 b4 b3 b2 b1 b0 R1 R0 PLL_A1 PLL_A0 CPSEL2 CPSEL1 CPSEL0 PSC_SEL PLL_A[1:0]: VCO amplitude CPSEL[2:0]: charge pump output current PSC_SEL: prescaler modulus select ('0' for P=16, '1' for P=19) where DR equals { 1 for direct output 0.5 for output divided by 2 0.25 for output divided by 4 F OUT D R B ( PA ) F REF CLK – R ----------------------------------- × + × × = |
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