STM32WL33CBVA datasheet(54/91 Pages) STMICROELECTRONICS

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6.3.6

RF transmitter

Characteristics measured over recommended operating conditions unless otherwise specified. All typical values

are referred to a temperature of 25 °C, VBAT = 3.3 V. All performance data is referred to the reference design with

a 50-ohm antenna connector.

Transmission measurements are performed for VDD = 3.3 V, TA = 25 °C, SMPS ON, SMPS frequency 4 MHz,

SMPS Vout value dependent on the desired output power =1.4V, 16 MHz system clock, HSIPLL mode, HSE GMC

setting 0x0A

TX measurements are given for HPM test conditions:

VDD = 3.3V, TA = 25o C, SMPS ON, SMPS frequency 4 MHz (unless otherwise stated), SMPS Vout according to

output power, 16 MHz system clock, HSI mode.

Table 36. RF transmitter characteristics

Parameter

Test condition

RF power

Unit

Maximum output power

TX mode, SMPS = 2 V

dBm

TX mode, SMPS = 1.4 V

TXHP mode, SMPS = 1.5 V

PA_DEGEN_ON

TX+TXHP mode, SMPS = 2 V

PA_DEGEN_ON

Output power step (all modes)

All BOMs, all frequencies

0.5

Table 37. PA impedance

Parameter

Test condition

Typ

Unit

Optimum load impedance

433 MHz 10 dBm, TX mode, Vsmps = 1.4 V

52 Ω // 35 nH

433 MHz 14 dBm, TXHP mode, Vsmps = 1.4 V

37 Ω // 37 nH

433 MHz 16 dBm, TXHP mode, Vsmps = 1.6 V

37 Ω // 37 nH

868-929 MHz 10 dBm, TX mode, Vsmps = 1.4 V

40 Ω // 36 nH

868-929 MHz 14 dBm, TXHP mode, Vsmps = 1.4 V

32 Ω // 16 nH

868-929 MHz 16 dBm, TXHP mode,

PA_DEGEN_ON, Vsmps = 1.5 V

44 Ω // 18 nH

902-928 MHz 20 dBm, TX+TXHP mode,

PA_DEGEN_ON, Vsmps = 2.2 V

20 Ω // 6 nH

Table 38. Regulatory standards

Frequency band

Suitable for compliance with:

413 - 479 MHz

ETSI EN300 220 category 1

FCC part 15, FCC part 90

ARIB STD-T67

826 - 958 MHz

ETSI EN300 220-2 category 1

FCC part 15

ARIB STD-T108

STM32WL33xx

Electrical characteristics

DS14221 - Rev 5

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