C12 datasheet(41/72 Pages) AMSOSRAM

41 / 72 page

AS3688

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (ptr,tje)

Revision 1.1.1 / 20060707

39 - 70

Addr: 2Ch

gpio_current

Bit

Bit Name

Default

Access

Description

pattern_slow

R/W

Pattern timing control

0b = normal mode

1b = slow mode (all pattern times are increased by a

factor of eight)

7.4.6 Overtemp comparator

If the LED temperature for CURR3x flash led is monitored with an external temperature sensor, the current sink

CURR3x can be automatically switched from strobe to preview current levels, if the external temperature sensor’s

voltage drops below VOVtemp. to avoid overheating of the flash LED.

The overtemperature comparator is multiplexed to GPIO2 and is switched on automatically, if Bit

curr3x_ext_ovtemp is set.

Table

15 – Overtemp comparator Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

VOVtemp

Comparator switch level

1.22

1.25

1.28

7.4.6.1 Overtemp comparator Registers

Curr3 control1

Addr: 12h

This register select the modes of the current sinks30..33 current.

Bit

Bit Name

Default

Access Description

preview_off_after

strobe

R/W

Select the switch off mode after strobe pulse

0=normal preview/strobe mode,

1=switch off preview after strobe duration has expired

2:1

preview_ctrl

00b

R/W

Preview is triggered by

00b = off

01b = software trigger

10b = GPIO active high

11b = GPIO active low

R/W

reserved

curr3x_ext_ovtemp

R/W

Selects overtemperature switch off of flash LED

0b = normal operation of CURR3x

1b = if the voltage on GPIO drops below 1.25V (above 1.25V if

ext_ov_temp_inv=1), CURR3x is switched from strobe to preview

current levels

(can be used to monitor the temperature of the flash led or as

general input to reduce the current through the flash LED e.g. to

temporarily reduce the current from the battery)

curr3x_strobe_high

R/W

Doubles curr3x current during strobe

0b = normal operation of CURR3x (0..160 mA)

1b = Doubles current during strobe (0..320mA)

R/W

reserved

curr33_pattern

R/W

Additional CURR33 control bit

0b = CURR33 controlled according curr33_mode register

1b = CURR33 controlled by LED pattern generator

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