Ds1302 pin function diagram and application circuit

The following is the circuit diagram of [ds1302 pin function diagram and application circuit]

DS1302 is a high-performance 23621, low-power, real-time clock circuit with RAM TDA2507T, which can time the year, month, day, sun, hour, minute and second, with leap year compensation function, working voltage is 2.5V ~5.5VMK005CL4. The three-wire interface is used for synchronous communication with the CPU, and multiple bytes of clock signals or RAM data can be transmitted at one time in a burst mode. The DS1302 has a 31 x 8 RAM register for temporary data storage. The DS1302 is an upgraded version of the DS1202 that is compatible with the DS1202, but adds dual power pins for the main power/back power supply and provides the ability to charge the back power supply with a fine current.

Ds1302 pin function and structure Figure 1 shows the pin arrangement of the DS1302, where Vcc1 is the backup power supply and VCC2 is the main power supply. The continuous operation of the clock can also be maintained with the main power off. The DS 1302 is powered by the larger of either Vcc1 or Vcc2. When Vcc2 is greater than Vcc1+0.2V, Vcc2 supplies power to the DS1302. When Vcc2 is less than Vcc1, DS1302 is powered by Vcc1. X1 and X2 are oscillation sources with an external 32.768kHz crystal. RST is the reset/chip select line that initiates all data transfers by asserting the RST input high. The RST input has two functions, RFBLN2012090A1T: First, the RST turns on the control logic, allowing the address/command sequence to be sent to the shift register SMBJ70A-TR. Second, the RST provides a means of terminating the transfer of single-byte or multi-byte data. When RST is high, all data transfers are initialized, allowing operation of the DS1302. If RST is asserted low during transfer, the data transfer is terminated and the I/O pin becomes high impedance. During power-up, RST must be held low until Vcc ≥ 2.5V. RST can be asserted high only when SCLK is low. I/O is serial data input and output (bidirectional), which is described in detail later. SCLK is always the input.

(Editor: Circuit Diagram)