C11 datasheet(42/72 Pages) AMSOSRAM

42 / 72 page

AS3688

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (ptr,tje)

Revision 1.1.1 / 20060707

40 - 70

Curr low voltage status2

Addr: 2Bh

This register controls the curr42 current sink current.

Bit

Bit Name

Default

Access

Description

ovtemp_ext

Overtemp comparator status bit

0b = no overtemperature, GPIO2>1.25V

1b = overtemperature, GPIO2<1.25V

Addr: 2Ch

gpio current

Bit

Bit Name

Default

Access

Description

ext_ov_temp_inv

R/W

Polarity of external overtemp comparator

0b = active high (Overtemperature when Vgpio>1.25V)

1b = active low (Overtemperature when Vgpio< 1.25V)

7.4.7 External chargepump

This external charge pump uses external schottky diodes and capacitors to generate low current outputs in the

range of –15V to +15V. The device delivers a square wave signals and an inverted square wave signals at

250kHz or 500kHz with full Battery voltage swing. Depending on the external configuration the battery voltage is

multiplied and / or inverted. A feedback loop with a dedicated regulation pin controls the output voltage by

modulating the duty circle.

E.g.: There are 3 Schottky Diodes, 2 Resistors and 3 Capacitors externally required for –6V output voltage.

For the Schottky Diodes the BAS40 (2 diodes in a SOT666 package) is recommended.

Table

16 – External Charge Pump Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

Vfb00

Negative output mode

feedback voltage

-20

Regulated, with internal current

source

Ifb

Feedback current

9.7

10.3

µA

Current sourced at feedback pin

for negative mode

Vfb01

Positive output mode

feedback voltage

1.22

1.25

1.28

Regulated, with two external

resistors

Vout00

Output Voltage mode 00b

-6

with external 600k resistor

Vout01

Output Voltage mode 01b

with external 125kΩ resistor

and 1.375 MΩ

Battery Voltage 3.5V

Efficiency

Battery Voltage 4.2V

Iout

Output Current

@ -6V

Iout

Output Current

@ +15V

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