DRV201A Datasheet, PDF (12/25 Pages) Texas Instruments – VOICE COIL MOTOR DRIVER FOR CAMERA AUTO FOCUS

DRV201A
SLVSBN6 – JUNE 2013
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User Example 1
In Figure 6, lens settling time and settling window shows how lens control is defined. Below is an example case
how the lens is controlled and what settling time is achieved:
Measured VCM resonance frequency = 100 Hz
• According to Table 1, VCM_FREQ[7:0] = ‘10111111’ (reg 0x07h)
VCM resonance frequency, f_VCM, variation is within ±10% (min 90 Hz … max 110 Hz)
• 1/f_VCM ringing compensation is used : RING_MODE = ‘1’ (reg 0x06h)
Stepping the lens by 50 µm
• The lens is settled into a ±5-µm window within 10 ms (1/f_VCM)
User Example 2
If the case is otherwise exactly the same, but VCM resonance frequency cannot be guaranteed to stay at more
than ±30% variation, slower ringing compensation should be used:
Measured VCM resonance frequency = 100 Hz
• According to Table 1, VCM_FREQ[7:0] = ‘10111111’ (reg 0x07h)
VCM resonance frequency, f_VCM, variation is within ±30% (min 70 Hz … max 130 Hz)
• 2/f_VCM ringing compensation is used : RING_MODE = ‘0’ (reg 0x06h)
Stepping the lens by 50 µm
• The lens is settled into a ±5-µm window within 20 ms (2/f_VCM)
±10% step
size window
settling time
Lens position
Time
Figure 6. Lens Settling Time and Settling Window
12
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