DS1680 datasheet(23/23 Pages) DALLAS

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DS1680

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NOTES:

1. Logic 1 voltages are specified at VCC = 3.3V or 5.0V, VOH = VCC for capacitive loads. Exclude RST

pin.

2. Logic 0 voltages are specified at VCC = 3.3 or 5.0V, VOL = GND for capacitive loads.

3. ICCA is specified with outputs open, CS set to a logic 1, SCLK = 500kHz, oscillator enabled, ADC

disabled, and no pen detected.

4. ICCS is specified with CS, VCCO open and I/O, SCLK at logic 0, ADC disabled, and no pen detected.

5. IAVDA is specified with ADC enabled.

6. IAVDS is specified with ADC disabled.

7. CS has a 40k

Ω pulldown resistor to ground.

8. Measured at VIH = 2.0V or VIL = 0.8V and 10ns maximum rise and fall time.

9. Measured at VOH = 2.4V or VOL = 0.4V.

10. Load capacitance = 25pF.

11. ICCO = 100 mA, VCC > VCCTP.

12. VCCO switchover from VCC to VBAT occurs when VCC drops below the lower of VCCSW and VBAT.

13. Current from VCC input pin to VCCO output pin.

14. Current from VBAT input pin to VCCO output pin.

15. Timebase is generated by the crystal oscillator. Accuracy of this time period is based on the 32kHz

crystal that is used. A typical crystal with a specified load capacitance of 6pF will provide accuracy

within

±100ppm over the 0°C to +70°C temperature range. For greater accuracy, see the DS32kHz

data sheet.

16. If the EOSC bit in the control register is set to a logic 1, tRPU is equal to 250ms plus the start-up time

of the crystal oscillator.

17. VCC = 0V, VAVD = 0V, VBAT = 3.7V. and oscillator enabled. Measured without RAM connected.

18. VCC = 0V, VAVD = 0V, VBAT = 3.7V, and oscillator disabled. Measured without RAM connected.

19. ICCPD is specified with outputs open, CS set to a logic 1, SCLK = 500kHz, oscillator enabled, ADC

enabled, and pen detected.

20. Under certain slew rate conditions, VSW can be as low as 1.8V.

DS1680 Datasheet(PDF) 23 Page - Dallas Semiconductor