AS3649

Datasheet - Electrical Character i s t ics

www.ams.com/AS3649

1.0-2

7 - 39

Digital Interface

High Level Input Voltage

Pins ON, SCL, SDA.

and TXMASK/TORCH

1.26

V

Low Level Input Voltage

0.0

0.54

V

High Level Input Voltage

Pin STROBE.

0.84

V

Low Level Input Voltage

0.0

0.54

V

Low Level Output Voltage

0.3

V

Leakage current

Pins ON, SCL, SDA

-1.0

0.0

+1.0

µA

Pulldown current to GND

5

Pins STROBE and TXMASK/TORCH

36

µA

TORCH debounce time

6.3

9

11.7

ms

1.5

µs

I

SCL Clock Frequency

0

400

kHz

Bus Free Time Between a

STOP and START

Condition

1.3

µs

Hold Time (Repeated)

START Condition

6

0.6

µs

LOW Period of SCL Clock

1.3

µs

HIGH Period of SCL Clock

0.6

µs

Setup Time for a Repeated

START Condition

0.6

µs

Data Hold Time

7

00.9

µs

Data Setup Time

8

100

ns

Rise Time of Both SDA and

SCL Signals

20 +

300

ns

Fall Time of Both SDA and

SCL Signals

20 +

300

ns

Setup Time for STOP

Condition

0.6

µs

Capacitive Load for Each

Bus Line

400

pF

I/O Capacitance (SDA,

SCL)

10

pF

1. To improve efficiency at low output currents, the active part of the internal switching transistor PMOS is reduced in size to 1/5 its original

size. This reduces the current required to drive the PMOS transistor and therefore improves overall efficiency at low output currents.

4. Accuracy defined in % of current setting and in absolute value (µA), accuracy values have to be added together

5. A pulldown current of 36µA is equal to a pulldown resistor of 42k

 at 1.5V

6. After this period, the first clock pulse is generated

undefined region of the falling edge of SCL.

automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of

Table 3. Electrical Characteristics (Continued)

Symbol

Parameter

Condition

Min

Typ

Max

Unit