Rainbow Electronics DS1680 - Manual (Page 23)

DS1680
23 of 23
NOTES:
1. Logic 1 voltages are specified at V
CC
= 3.3V or 5.0V, V
OH
= V
CC
for capacitive loads. Exclude RST
pin.
2. Logic 0 voltages are specified at V
CC
= 3.3 or 5.0V, V
OL
= GND for capacitive loads.
3. I
CCA
is specified with outputs open, CS set to a logic 1, SCLK = 500kHz, oscillator enabled, ADC
disabled, and no pen detected.
4. I
CCS
is specified with CS, V
CCO
open and I/O, SCLK at logic 0, ADC disabled, and no pen detected.
5. I
AVDA
is specified with ADC enabled.
6. I
AVDS
is specified with ADC disabled.
7. CS has a 40k
Ω
pulldown resistor to ground.
8. Measured at V
IH
= 2.0V or V
IL
= 0.8V and 10ns maximum rise and fall time.
9. Measured at V
OH
= 2.4V or V
OL
= 0.4V.
10. Load capacitance = 25pF.
11. I
CCO
= 100 mA, V
CC
> V
CCTP
.
12. V
CCO
switchover from V
CC
to V
BAT
occurs when V
CC
drops below the lower of V
CCSW
and V
BAT
.
13. Current from V
CC
input pin to V
CCO
output pin.
14. Current from V
BAT
input pin to V
CCO
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, t
RPU
is equal to 250ms plus the start-up time
of the crystal oscillator.
17. V
CC
= 0V, V
AVD
= 0V, V
BAT
= 3.7V. and oscillator enabled. Measured without RAM connected.
18. V
CC
= 0V, V
AVD
= 0V, V
BAT
= 3.7V, and oscillator disabled. Measured without RAM connected.
19. I
CCPD
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, V
SW
can be as low as 1.8V.