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AS3647/47B
Datasheet, Confidential - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 4. Electrical Characteristics (Continued)
Symbol
V VOUTMAX
Parameter
V VOUT overvoltage
protection
Condition
DCDC Converter Overvoltage Protection
Min
5.0
Typ
5.3
Max
5.6
Unit
V
PWM duty cycle
I LIMIT
Current Limit for coil
L DCDC (Pin SW)
measured at 40%
3
default value
coil_peak =00b
coil_peak =01b
coil_peak (see
page 24) =10b
1.8
2.25
2.7
2.0
2.5
3.0
2.23
2.78
3.34
A
maximum 40000s
lifetime operation in
overcurrent limit
coil_peak =11b
3.15
3.5
3.9
V LEDSHORT
T OVTEMP
T OVTEMPHY
ST
Flash LED short
circuit detection
voltage
Overtemperature
Protection
Overtemperature
Hysteresis
Voltage measured between pins VOUT1,2 and
LED_OUT1,2
Junction temperature
1.0
144
5
V
oC
oC
t FLASHTIMEO
UT
Flash Timeout Timer
Can be adjusted with register
flash_timeout (page 26)
accuracy
Falling V VIN
2
-7.5
2.25
2.4
1280
+7.5
2.5
ms
%
V
V UVLO
Undervoltage Lockout
Rising V VIN
V UVLO V UVLO V UVLO
+0.05 +0.1 +0.15
V
Digital Interface
( ext_torch_on =01)
V IH
V IL
V IHFLASH
V ILFLASH
V OL
High Level Input
Voltage
Low Level Input
Voltage
High Level Input
Voltage
Low Level Input
Voltage
Low Level Output
Voltage
Pins SCL, SDA.
Pin TXMASK/TORCH in external torch mode
( ext_torch_on =10)
Pin STROBE.
Pin TXMASK/TORCH for TxMask mode
4
pin SDA, I OL =3mA
1.26
0.0
0.7
0.0
V VIN
0.54
V VIN
0.54
0.3
V
V
V
V
V
GND
I LEAK
I PD
t DEBTORCH
t TIMEOUT
Leakage current
Pulldown current to
5
TORCH debounce
time
SCL timeout
Pins SCL, SDA
Pins TORCH, STROBE and TXMASK/TORCH
In indicator, assist or flash mode, if SCL is low
longer than this timeout, the AS3647/47B
automatically enters shutdown mode
-1.0
6.3
35
0.0
36
9
+1.0
11.7
100
μA
μA
ms
ms
I C mode timings - see Figure 4 on page 9
2
f SCLK
SCL Clock Frequency
1/
t TIMEO
400
kHz
UT
t BUF
Bus Free Time
Between a STOP and
START Condition
1.3
μs
www.austriamicrosystems.com/AS3647
1.5-4
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