AS3676 datasheet(36/92 Pages) AMSCO

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AS3676

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

8.4.5

General Purpose Current Sinks CURR4x

These low voltage current sinks have a resolution of 8 bits and can sink up to 38.25mA.

General Purpose Current Sinks CURR4x Registers

Table 45. CURR4x Sinks Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Unit

IBIT7

Current sink if Bit7 = 1

For V(CURRx) > 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

CURR4x

IBIT7 and IBIT6

-5

all other bits

-10

+10





2. Variation between the programmed current and the actual current

absolute Accuracy

-15

+15

VCURR41,42,43x

Voltage compliance

0.2

CPO

Table 46. curr4 control

Addr: 04h

curr4 control

This register selects the mode of the current sinks CURR41, CURR42,

CURR43

Bit

Bit Name

Default Access

Description

1:0

curr41_mode

0R/W

Select the mode of the current sink CURR41

00b

off

01b

10b

PWM controlled

11b

LED pattern controlled

3:2

curr42_mode

0R/W

Select the mode of the current sink CURR42

00b

off

01b

10b

PWM controlled

11b

LED pattern controlled

5:4

curr43_mode

0R/W

Select the mode of the current sink CURR43

00b

off

01b

10b

PWM controlled

11b

LED pattern controlled

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