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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32WL55JC датащи(PDF) 20 Page - STMicroelectronics |
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STM32WL55JC датащи(HTML) 20 Page - STMicroelectronics |
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20 / 145 page  Functional overview STM32WL55/54xx 20/145 DS13293 Rev 1 3.9.3 Transmitter The transmit chain comprises the modulated output from the modem, that directly modulates the RF-PLL. An optional pre-filtering of the bit stream can be enabled to reduce the power in the adjacent channel also dependent on the selected modulation scheme. The modulated signal from the RF-PLL directly drives the high output power PA (HP PA) or low output power PA (LP PA). Transmitter high output power Transmit high output power up to + 22 dBm, is supported through the RFO_HP RF pin. For this, the REG PA must be supplied directly from VDD on VDDSMPS pin, as shown in the figure below. The output power range is programmable in 32 steps of ~ 1 dB. The power amplifier ramping timing is also programmable.This allows adaptation to meet radio regulation requirements. Figure 3. High output power PA The table below gives the maximum transmit output power versus the VDDPA supply level. Table 4. Sub-GHz radio transmit high output power VDDPA supply (V) Transmit output power (dBm) 3.3 + 22 2.7 + 20 2.4 + 19 1.8 + 16 MSv62616V2 VLXSMPS VFBSMPS (1.55V) VDDPA VR_PA (up to 3.1V) RFO_HP LDO/SMPS REG PA HP PA VLXSMPS VFBSMPS (1.55V) VDDPA VR_PA (up to 3.1V) RFO_HP LDO/SMPS REG PA HP PA VDD VDD VDD VDD VDDSMPS (1.8 to 3.6V) VDDSMPS (1.8 to 3.6V) LDO mode SMPS mode Note: Use of the SMPS is optional. When SMPS is not used, the BOM can be reduced by removing the coil between VLXSMPS and VFBSMPS pins. |
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