FEATURES*TP6837 USB Full Speed motion sensing Controller.
*Desk-off Mice
*2.4G Wireless transceiver.
*tenx Motion sensor technology.
*LED Indicators.
Circuit design
TP6837 wireless presenter device offers high performance and accurate sensor circuit.
1. Function Key Circuit
The TP6837 supports 5 function keys. All function keys are connected to the MCU GPIO.
The firmware will poll GPIO to get the key status.
2. PWM Output for LED Circuit
The LED indicators display the connection status. For example: frequency scanning,
connection strength, link quality and low battery. The MCU controls LED to light on/off
through the PWM Duty cycle.
3. OSC Circuit
The Pin FX1/FX2 is connected to a 24 MHz crystal. In Fast mode, the circuit provides
CPU clock and USB clock when TP6837 is plugged into a USB port. In Slow mode, the
external RC, connected to the RCOSC pin, provides clock to the MCU. In addition,
The TP6837 incorporates the wake up timer to trigger WUPINT per 0.5s. The wake up
timer clock source comes from the 32.768 KHz crystal, which is connected to LX1 and
LX2 pin.
4. Accelerometer Circuit (optional)
The three-axis accelerometer sensor is used to sense the momentum of hand motion
so that the MCU can transform the momentum data through SPI bus from the
accelerometer sensor. In addition, the decoupling capacitors (0.1 uF and 10 uF
capacitors) in circuit can adequately decouple the accelerometer from the power supply
noise.
5. RF module
The RF module is a 2.4 GHz RF transceiver. The TP6837 firmware can control the RF
module to avoid other noise baseband. Two TP6837 Presenter devices can be
connected to one dongle at the same time, too.
6. Gyroscope Circuit
Power supply decoupling capacitors (100 nF and 10 μF ceramic) should be placed as
near as possible to the device (common design practice). The Gyroscope VDDA (pin 16)
and VDDD (pin 15) lines should be kept separated to avoid switching noise coupling on
the analog side.