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AS3665
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n C l o c k G e n e r a t i o n
Clock Generation
The AS3665 has an internal oscillator running at f CLK and an external clock input CLK32K:
Figure 17. Clock Generation
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AS3665
The charge pump and the PWM generator use the f CLK clock signal from the internal oscillator. Depending on the sig-
nal sel_ext_clock , the internal timers and ramp generators use either the pin CLK32K as input or f CLK divided by 2 and
31:
Table 7. GPO_Control Register
Addr: 04h
GPO_Control Register
Bit
Bit Name
Default Access
Description
Enables the external clock on CLK32K (see Figure 17)
osc_always_on =0)
6
sel_ext_clock
0h
R/W
0
1
Use internal f CLK clock divided by 31*2
Use external clock on CLK32K (also
1
1. Using an external clock has two advantages:
a) Reduced quiescent current: the internal clock is switched off whenever possible and the timers run from
CLK32K.
b) All timings (e.g. ramp-up, wait) are as accurate as the external clock (usually derived from a crystal).
The external clock on CLK32K is monitored and if the internal clock is enabled and no valid clock are detected the reg-
ister bit no_extclock_detected (see page 37) is set and an interrupt can be triggered.
The internal oscillator is enabled and disabled automatically if register bit osc_always_on is reset:
Table 8. Supervision Register
Addr: 08h
Supervision Register
Bit
Bit Name
Default Access
Description
Enables the internal oscillator (see Figure 17)
5
osc_always_on
0h
R/W
0
Enable internal oscillator only if required
1
The internal oscillator is always running (except in
shutdown mode)
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