DS1302 is a high-performance, low-power, real-time clock circuit with RAM introduced by DALLAS Corporation of the United States. It can time the year, month, day, week, hour, minute, and second, and has the function of leap year compensation. The operating voltage is 2.0V～5.5V. A three-wire interface is used to communicate with the CPU synchronously, and a burst mode can be used to transmit a clock signal or RAM data of multiple bytes at a time. DS1302 has a 31 × 8 RAM register for temporarily storing data. DS1302 is an upgraded product of DS1202, which is compatible with DS1202, but adds dual power supply pins for main power supply/backup power supply, and also provides the capability of trickle current charging for backup power supply.

structure

The pin arrangement of DS1302, in which Vcc2 is the main power supply, and VCC1 is the backup power supply. It also keeps the clock running continuously even when the main power is turned off. The DS1302 is powered by the greater of Vcc1 or Vcc2. When Vcc2 is greater than Vcc1+0.2V, Vcc2 supplies power to DS1302. When Vcc2 is less than Vcc1, the DS1302 is powered by Vcc1. X1 and X2 are the oscillation sources, connected to a 32.768kHz crystal oscillator. RST is the reset/chip select line, which initiates all data transfers by driving the RST input high. The RST input has two functions: first, the RST turns on the control logic, allowing the address/command sequence to be fed into the shift register; second, the RST provides the means to terminate single-byte or multi-byte data transfers. When RST is high, all data transfers are initiated, allowing operation of the DS1302. If RST is set to low level during the transfer process, the data transfer will be terminated, and the I/O pins will become high-impedance. During power-up operation, RST must be kept low until Vcc>2.0V. RST can be set high only when SCLK is low. I/O is a serial data input and output terminal (bidirectional), which will be described in detail later. SCLK is the clock input

74HC04D/74HC14DSOP

74HC08D/74HC00SOP

74HC4051/74HC4052/74HC4053SOP

74HC573D/74HC574DSOP20

74HC373D/74HC374D/74HC244DSOP20

74HC245DSOP20/TSSOP20

74HC138D/74HC164D/74HC165DSOP

74HC165N/74HC164NDIP

74HC02D/74HC032DSOP

74HC74D/74HC86DSOP

74HC595D/74HC595NSOP16/DIP16/

CD40 series and more

CD4011/CD4001/CD40106SOP

CD4060/CD4069SOP/DIP

CD4051/CD4052/CD4053SOP/DIP

CD4020SOP/DIP

CD4093/CD4094SOP/DIP

HEF4051/HEF4052SOP

Amplifier IC and more

8002A/8002BSOP8

8002DSOP8

LM4871SOP8

LM4863SOP16/DIP16/TSSOP20

LM386M-1/LM386N-1SOP8/DIP8

PAM8403SOP16

XPT8871ESOP8 with heat sink

TDA2030A/TDA2003ATO-220

TA8227HDIP

PT2399/CD2399SOP can output whiteboard

Op amp ICs and more

LM321 SOT23-5

LMV321SOT23-5/SOT-353

LMV358SOP8/MSSOP8/TSSOP8

LMV324SOP14

SGM721/LMV721SOT23-5/SOP8

SGM8521SOT23-5

SGM8052SOP8

LMV722/SGM8632SOP8

SGM724SOP14

LM2904/LM258/LM358SOP8

LM358/LM324DIP

LM385-1.2V/2.5VTO-92/SO-23/SOP8

LM336-2.5VTO-92

LM567CM/LM567CNSOP/DIP

Time base IC

NE555DR/NE555DTSOP

NE555P/NE555NDIP

NE556NDIP

NE556DTSOP

There are many more charging power management ICs,

LTC4054SOT23-5

KA7500BSOP16

TL494IDR/TL494CNSOP/DIP

KA3842/3843/3845/KA3844/UC3844DIP/SOP

KA2845SOP8

OB2269DIP16

OB2263SOT23-6/DIP8

XL1410SOP8

AMS1117-1.2/1.5/1.8/2.5/3.3/ADJ SOT-223/SOT-89/TO-252

Other advantage models

BISS001SOP

ULN2003/ULN2803SOP/DIP

ICL7660SOP/DIP

SN75176SOP/DIP

EV1527SOP/DIP

L298N/82C55AC-2SHIP

L293D/L293DDSOP/DIP

MAX485SOP/DIP

DS1302SOP

PT4115SOT-89

SG3525SOP

OP07CPDIP

HT75/HT71/HT73...SeriesSOT89/SOT-23

78M/79M series XL original

Company: Shenzhen Detian Technology Co., Ltd.

Contact: Li Lin

Mobile: 18680308178

Address: Room 1606, Block A, Overseas Decoration Building, No. 122 Zhenhua Road, Futian District, Shenzhen