Infrared interface (IRTIM) RM0440
1488/2126 RM0440 Rev 4
33 Infrared interface (IRTIM)
An infrared interface (IRTIM) for remote control is available on the device. It can be used
with an infrared LED to perform remote control functions.
It uses internal connections with TIM16 and TIM17 as shown in Figure 500.
To generate the infrared remote control signals, the IR interface must be enabled and TIM16
channel 1 (TIM16_OC1) and TIM17 channel 1 (TIM17_OC1) must be properly configured to
generate correct waveforms.
The infrared receiver can be implemented easily through a basic input capture mode.
Figure 500. IRTIM internal hardware connections with TIM16 and TIM17
All standard IR pulse modulation modes can be obtained by programming the two timer
output compare channels.
TIM17 is used to generate the high frequency carrier signal, while TIM16 generates the
modulation envelope.
The infrared function is output on the IR_OUT pin. The activation of this function is done
through the GPIOx_AFRx register by enabling the related alternate function bit.
The high sink LED driver capability (only available on the PB9 and PA13 pins) can be
activated through the I2C_PB9_FMP bit in the SYSCFG_CFGR1 register and used to sink
the high current needed to directly control an infrared LED.
MS34517V1
TIM17_CH1
TIM16_CH1
IRTIM
IR_OUT
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