AS3687 datasheet(20/55 Pages) AMSCO

20 / 55 page

AS3687/87XM

Datasheet

www.austriamicrosystems.com/AS3687

1v3-4

19 - 54

7.3.1 High Voltage Current Sinks CURR1, CURR2, CURR6

The high voltage current sinks have a resolution of 8 bits. Additionally an internal protection circuit monitors with

a voltage divider (max 3µA @ 15) the voltage on CURR1, CURR2 and CURR6 and increases the current in off

state in case of overvoltage.

Table

8 – HV - Current Sinks Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

IBIT7

Current sink if Bit7 = 1

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

For V(CURRx) > 0.45V

Δm

matching Accuracy

-10

+10

CURR1,CURR2,CURR6

absolute Accuracy

-15

+15

VCURRx

Voltage compliance

0.45

Ov_prot_

13V

Overvoltage Protection of

current sink CURR1,2,6

3.0

μA

At 13V, independent of

curr1_prot_on, curr2_prot_on or

curr6_prot_on

Ov_prot_

15V

Overvoltage Protection of

current sink CURR1,2,6

0.8

4.0

At 15V, step_up_on=1,

curr1_prot_on=1 for CURR1,

curr2_prot_on=1 for CURR2,

curr6_prot_on=1 for CURR6

7.3.1.1 High Voltage Current Sinks CURR1, CURR2, CURR6 Registers

Addr: 09h

Curr1 current

This register controls the High voltage current sink current.

Bit

Bit Name

Default

Access

Description

7:0

curr1_current

R/W

Defines current into Current sink curr1

00h = 0 mA

01h = 0.15 mA

...

FFh = 38.25 mA

Addr: 0Ah

Curr2 current

This register controls the High voltage current sink current.

Bit

Bit Name

Default

Access

Description

7:0

curr2_current

R/W

Defines current into Current sink curr2

00h = 0 mA

01h = 0.15 mA

...

FFh = 38.25 mA

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