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NXP Semiconductors
SSL3250A
Photo flash dual LED driver
600
I LED (mA)
500
400
300
200
100
70
0
357
125
Flash current using direct control mode
50
Resistor
Value (k Ω )
014aaa367
Fig 8.
Flash mode LED current in Direct enable mode
8.3.5 Timed Flash mode
The timed operation of the Flash mode can only be used in the I 2 C interface mode. When
the flash is used in Timed mode (bit 4, TO_DEF = 1 in Timer control register 01h), the
internal timer will switch off the main LED after the preprogrammed maximum time in the
timer control register has expired.
The timer starts when the Flash mode is activated either by the software strobe
(FLASH_STRB bit in register 02h) or by a LOW to HIGH transition of the hardware strobe
(STRB pin) signal.
In timed mode strobing of the flash is edge sensitive, therefore the flash time is
independent of the level of the software or hardware strobe signal. The flash time is set
according to Equation 5 :
t flash = 820 ms – Register × 54.6 ms
(5)
Once the Flash time has expired no interrupt will be generated nor will it be flagged in the
status register. A new flash period can be started immediately after the previous timed
flash period has expired.
8.3.6 Flash mode during RF transmit
Although the driver is not equipped with a separate TXMASK pin, the device can operate
like that to lower the current in the main LED in Flash mode during an RF transmission in
a mobile phone application. An external switch can be connected to the resistor
controlling the nominal current value for the Flash mode. By lowering the current in the
main LED, the inductor current and therefore the current drawn from the battery will be
lowered. Reducing the inductor current has to be fast because the inductor current is
reduced within 50 μ s after changing the nominal current level to a lower setting. At the end
of the transmission period, the main LED current can be increased again to the nominal
current level. A soft start circuit will increase the inductor current with a limited slope as
defined by the soft start settings. See Section 8.5 .
SSL3250A_5
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 16 December 2009
10 of 26
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