Hello,
I'm using ds1307z+ in my project , not the module just chip.
When battery disconnect chip working fine and I can see the address of ds1307 as if 0x68 but when battery connect which is cr1202 , the chip crash and I couldn't see of the address of ds1307.
There is an another thing with ds1307, I tried 20 chip and 15 of them doesn't not work but 5 of them work very well with battery.
What can be the problem I can't figure out I tired everything any suggestion do you guys have?
What can be the problem I can't figure out I tired everything any suggestion do you guys have?
I don't know what the DS1307z+ version is, at least Digikey and Mouser link to the standard DS1307 datasheet, so I'm guessing it's a standard DS1307 technically.
In this case the power supply is the problem. You power with 3.3V but the chip expects 4.5 to 5.5V. If the Vcc voltage is below 1.25 * Vbat the I2C interface is disabled by the chip, so in your case always as soon as a battery is applied.
pylon:
I don't know what the DS1307z+ version is, at least Digikey and Mouser link to the standard DS1307 datasheet, so I'm guessing it's a standard DS1307 technically.
In this case the power supply is the problem. You power with 3.3V but the chip expects 4.5 to 5.5V. If the Vcc voltage is below 1.25 * Vbat the I2C interface is disabled by the chip, so in your case always as soon as a battery is applied.
Thank you for reply.
I thought about that and disconnect to VCC and supply the ds1307 only battery nothing change still not working . By the way I want datasheet from supplier he send me maxim integrated datasheet which is here https://datasheets.maximintegrated.com/en/ds/DS1307.pdf
If it can be problem how can the 5 chips works but 15 doesn't work any suggestion ?
I thought about that and disconnect to VCC and supply the ds1307 only battery nothing change still not working .
Sure! Did you read my answer? If you don't supply any voltage to Vcc the voltage is 0 which is certainly below 1.25*Vbat.
If it can be problem how can the 5 chips works but 15 doesn't work any suggestion ?
Actually I don't care. But I guess the chips are identical but the voltage of the used batteries were different. But that's wild guessing...
If you use a chip outside it's specs you should expect that it may not behave consistently.
This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.