The following is the circuit diagram of [DS1302 pin function and application circuit].
The DS1302 is a high-performance, low-power real-time clock (RTC) with built-in RAM, compatible with the TDA2507T. It can keep track of time in terms of year, month, day, hour, minute, and second, and also includes a leap year compensation feature. The device operates within a voltage range of 2.5V to 5.5V, making it suitable for a wide range of applications. It uses a three-wire interface for communication with the CPU, allowing for efficient data transfer in burst mode. This means that multiple bytes of clock information or RAM data can be transmitted at once, improving performance.
The DS1302 features a 31 x 8 RAM register, which serves as temporary storage for data. It is an improved version of the DS1202, offering compatibility with the older model while introducing additional features such as dual power pins for main and backup power supply. This allows for more reliable operation, even when the main power is disconnected. Additionally, the DS1302 supports fine current charging of the backup power supply, ensuring continuous operation under various conditions.
Figure 1 shows the pin configuration of the DS1302. Vcc1 is the backup power supply, and Vcc2 is the main power supply. The clock can continue running even when the main power is turned off, as the device automatically switches to the higher of the two voltages. When Vcc2 is greater than Vcc1 + 0.2V, the DS1302 is powered by Vcc2. If Vcc2 is lower than Vcc1, it uses Vcc1 instead.
X1 and X2 are the external oscillation pins, typically connected to a 32.768kHz crystal to maintain accurate timekeeping. RST is the reset and chip select line, used to initiate all data transfers. When RST is set high, it activates the control logic, allowing the address and command sequence to be sent to the shift register. It also serves as a way to terminate data transfers. If RST is pulled low during a transfer, the process stops, and the I/O pin goes into a high-impedance state.
During power-up, RST must remain low until the voltage reaches at least 2.5V. RST can only be set high when the SCLK signal is low. I/O is a bidirectional serial data input/output line, responsible for transferring data between the DS1302 and the host system. SCLK is always an input, controlling the timing of data transfers.
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