E1217X Datasheet, PDF (5/8 Pages) ATMEL Corporation – 32 KHZ STANDARD WATCH CMOS IC

Test Crystal
Specification
Additional Notes
Figure 2. Functional Test Circuit
V_SS
1
RESET
8
TEST
2
C_{TR OSCIN}
3
4
OSCOUT
e1217X
7 ^MOT1
R_L
6 ^MOT2
5
V_DD
e1217X
Range of trimmer capacitance: C_TR = 5 pF to 30 pF
Frequency
Series resistance
Static capacitance
Dynamic capacitance
Load capacitance
f = 32,768 Hz
R_S = 30 kW
C₀ = 1.5 pF
C₁ = 3 fF
C_L = 8 pF
1. It is recommended to connect the quartz case to V_DD (by conductive epoxy).
2. Capacitive coupling of TEST to OSCIN must be minimized by appropriate layout
of the PCB to avoid disturbancing the oscillator.
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4728A–CLOCK–06/03