User's Manual

KF-XXXX-X-XXX-版本
Figure 4 Power On Sequence
3
1.7.3 Interface
1.7.3.1 External Clock Reference ( SLEEP_CLK )
Table 7 External Clock Reference
Parameter Description Remarks
Nominal input frequency 32.768 KHz
Frequency accuracy +/-200 ppm
Duty cycle 30-70 %
Input signal amplitude 200 to 1800 mVp-p 200-1800 mVp-p to avoid additional
current consumption. 3.3Vp-p maximum.
Signal type Square-wave or sine-wave
Input impedance
100KΩ；< 5 pF when power is
applied or power is off
Clock jitter (integrated
over 300Hz – 15kHz)
<1 Hz
1.7.3.2 Input/Output DC Terminal Characteristics
Table 8 Input/Output DC Terminal Characteristics
Digital Terminals Min Typ Max Unit
V IL input logic level low - - 0.8 V
Input Voltage
V
IH input logic level high 2.0 - - V
VIN
VINVIN
VIN
VIN
VINVIN
VIN