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CC1010 Datasheet(PDF) 89 Page - Texas Instruments |
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CC1010 Datasheet(HTML) 89 Page - Texas Instruments |
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89 / 152 page  CC1010 SWRS047 Page 89 of 152 17.5 RF Transceiver RX/TX control and power management The RFMAIN register controls the operation mode (RX or TX), use of the dual frequency registers and several power down modes. In this way the CC1010 offers great flexibility for RF power management in order to meet strict power consumption requirements in battery- operated applications. Different power- down modes are controlled through individual bits in the RFMAIN register. There are separate bits to control the RX part, the TX part, the frequency synthesiser and the crystal oscillator. This individual control can be used to optimise for lowest possible current consumption in a certain application. A typical power-on sequence for minimum power consumption is shown in Figure 22. The figure assumes that frequency A is used for RX and frequency B is used for TX. If this is not the case, simply invert the F_REG setting. RFMAIN (0xC8) - RF Main Control Register Bit Name R/W Reset value Description 7 RXTX R/W 0 RX/TX Switch. 0 : RX 1 : TX 6 F_REG R/W 0 Select the frequency registers A or B 0 : Select frequency registers A 1 : Select frequency registers B 5 RX_PD R/W 1 Select power down for the LNA, mixer, IF filter and digital demodulator. 0 : Power up 1 : Power down 4 TX_PD R/W 1 Select power down of the digital modem and PA. 0 : Power up 1 : Power down 3 FS_PD R/W 1 Select power down of the frequency synthesizer 0 : Power up 1 : Power down 2 CORE_PD R/W 0 Power down of main crystal oscillator core. 0 : Power up 1 : Power down 1 BIAS_PD R/W 0 Power down of bias current generator and crystal oscillator buffer. 0 : Power up 1 : Power down 0 - R0 0 Reserved, read as 0 |
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