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4XR01T3V130 bảng dữ liệu(PDF) 11 Page - Holtek Semiconductor Inc |
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4XR01T3V130 bảng dữ liệu(HTML) 11 Page - Holtek Semiconductor Inc |
11 / 16 page Absolute Maximum Ratings The Absolute Maximum Ratings must be checked for discrepancies and the necessary care taken in device handling and usage. Power Supply Examination of the block diagram will reveal that the Power Supply and Ground pins of the RF Transmitter and MCU are independent and must be connected together if they are to share the same power supply. If the same power supply is to be used for both chips then care must be taken as both have different power supply requirements. When calculating the total current consumption of the device, the internal DC specification currents for the MCU and RF parts must be added together. The RF data to be transmitted is derived from the PB1 line. When the PB1 line is high the device will transmit allowing users to program their encoded data on this line. If the RF transmitter is in its standby mode then there will be a delay of about 500 ms before transmission begins. When the device is transmitting, a synchronising signal will be generated on the CREF/PB0 pin which allows the MCU to use it to calibrate its internal RC oscillator. To avoid the RF circuits entering an unknown state, pin PB1 should be setup as an output as soon as possible after power-on. To minimise power consumption, only when PB1 is high, can the RF signal be transmitted and the reference clock on PB0 be generated. If no data transitions are generated on PB1 for 300~500ms, the transmitter will enter a standby state and the RF circuits will be switched off along with the internal PLL to save power. The signal generated on the CREF/PB0 line will also remain at a low level. The internal PLL function is used to generate the RF frequency with a multiplier of 32 times the crystal frequency. The relationship is: RF frequency = 32 ´ Crystal frequency. Therefore a 9.84375MHz crystal will generate an RF frequency of 315MHz and a13.56MHz crystal will generate an RF frequency of 433.92MHz. All PLL circuits are contained within the device and the only external component required is a suitable crystal. Power Down and Wake up It is important to note that if the MCU is powered down or placed into a low power mode to conserve power, that the RF Transmitter may continue running and will consume a certain amount of power. Before powering down the MCU it is important to carefully manage the PB1 pin to ensure the RF-Transmitter enters its power down state. Programming Considerations As MCU lines PB0 and PB1 are used to control the RF transmitter function, care must be taken to manage these lines correctly in the application program. As line PB1 is used to send data to the RF circuitry this line must be setup as an output. To avoid erroneous operation of the RF circuits this line should be setup as an output immediately after power-on. The PB0 pin on the MCU is used to receive synchronising pulses from the RF circuits and should therefore be setup as an input. As the MCU will be powered down independently of the RF Transmitter Peripheral Module, care must be taken to ensure that the MCU first clears its PB1 line to zero before powering down. This will allow the RF Transmitter Peripheral Module to enter its standby state and thus keep power consumption to a minimum. HT46R01T3/HT48R01T3 8-Bit OTP MCU with RF Transmitter Rev. 1.30 11 November 23, 2010 |
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