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AS3676

Datasheet - D e ta i l e d D e s c r i p t i o n

8.4.3

Current Sinks CURR30, CURR31, CURR32, CURR33

These current sinks have a resolution of 8 bits and can sink up to 38.25mA. The current values can be controlled indi-

vidually with curr30_current – curr33_current or common with curr3x_strobe or curr3x_preview.

Current Sinks CURR3x Registers

Table 28. Current Sinks CURR30,31,32,33 Parameters

Symbol

Parameter

Condition

Min

Typ

Max

Unit

IBIT7

Current sink if Bit7 = 1

For V(CURR3x) > 0.2V

19.2

IBIT6

Current sink if Bit6 = 1

9.6

IBIT5

Current sink if Bit5 = 1

4.8

IBIT4

Current sink if Bit4 = 1

2.4

IBIT3

Current sink if Bit3 = 1

1.2

IBIT2

Current sink if Bit2 = 1

0.6

IBIT1

Current sink if Bit1 = 1

0.3

IBIT0

Current sink if Bit0 = 1

0.15

m

1. Variation between currents within this group

matching Accuracy

CURR30-33

IBIT7 and IBIT6

-5

all other bits

-10

+10





2. Variation between the programmed current and the actual current

absolute Accuracy

-15

+15

VCURR3X

Voltage compliance

0.2

CPO

curr3x_strobe_high=1 and strobe function

0.4

Table 29. Curr3 control2

Addr: 12h

Curr3 control2

This register selects 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

normal preview/strobe mode

switch off preview after strobe duration has

expired. To reinitiate the torch mode the

preview_ctrl has to be set off and on again

2:1

preview_ctrl

00b

R/W

Preview is triggered by

00b

off

01b

software trigger (setting this bit automatically

triggers preview)

10b

CURR2 active high; set gpi_curr2_en=1

11b

CURR2 active low; set gpi_curr2_en=1

curr3x_strobe_high

R/W

Double current on CURR30...CURR33

during strobe function

normal strobe current (0-37.8mA)

double strobe current (0-75.6mA)

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