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PDF AS3687XM Data sheet ( Hoja de datos )
| Número de pieza | AS3687XM | |
| Descripción | Flexible Lighting Management | |
| Fabricantes | austriamicrosystems | |
| Logotipo |  |
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AS3687/87XM
DDaatatsahseeht eet
AS3687/87XM
Flexible Lighting Management (Charge Pump, DCDC Step
Up, Seven Current Sinks, ADC, LED Test, Audio Light)
1 General Description
The AS3687/87XM is a highly-integrated CMOS
Lighting Management Unit for mobile telephones,
and other 1-cell Li+ or 3-cell NiMH powered
devices.
The AS3687/87XM incorporates one Step Up
DC/DC Converter for white backlight LEDs, one low
noise Charge Pump for indicator- or RGB- LEDs,
LED test circuit (production test of the soldered
LEDs at the customer site), one Analog-to-Digital
Converter, seven current sinks, a two wire serial
interface, and control logic all onto a single device.
Output voltages and output currents are fully
programmable. The AS3687XM has an audio input
to control one or two RGB LEDs.
The AS3687/87XM is a successor to the
austrimicrosystems AS3689 and therefore software
compatible to the AS3689 (software written for the
AS3689 can be easily reused for the
AS3687/87XM).
2 Key Features
High-Efficiency Step Up DC/DC Converter
− Up to 25V/50mA for White LEDs
− Programmable Output Voltage with
External Resistors and Serial Interface
− Overvoltage Protection
High-Efficiency Low Noise Charge Pump
− 1:1, 1:1.5, and 1:2 Mode
− Automatic Up Switching (can be disabled
and 1:2 mode can be blocked)
− Output Current up to 150mA
− Efficiency up to 95%
− Only 4 External Capacitors Required:
2 x 500nF Flying Capacitors, 2 x 1µF
Input/Output Capacitors
− Supports LCD White Backlight or RGB
LEDs
Seven Current Sinks
− All seven current sinks fully Programmable
(8-bit) from: 0.15mA to 38.5mA (CURR1,
CURR2, CURR6, CURR30, CURR31,
CURR32, CURR33)
− Three current sinks are High Voltage
capable (CURR1, CURR2, CURR6)
− Selectively Enable/Disable Current Sinks
Internal PWM Generation
− 8 Bit resolution
− Autonomous Logarithmic up/down
dimming
Led Pattern Generator
− Autonomous driving for Fun RGB LEDs
− Support indicator LEDs
10-bit Successive Approximation ADC
− 27µs Conversion Time
− Selectable Inputs: all current sources,
VBAT, CP_OUT, DCDC_FB
− Internal Temp. Measurement
Support for automatic LED testing (open and
shorted LEDs can be identified in-circuit)
Standby LDO always on if serial interface is on
− Regulated 2.5V max. output 10mA
− 3µA Quiescent Current
− Automatic wakeup if serial interface is
enabled (allows ultra low power for device
shutdown)
Audio can be used to drive RGB LED
(AS3687XM only)
− RGB Color and Brightness is dependent
on audio input amplitude
− Can drive one or two RGB LEDs
Wide Battery Supply Range: 3.0 to 5.5V
Two Wire Serial Interface Control
Overcurrent and Thermal Protection
Small Package
WL-CSP 4x5 balls 0.5mm pitch
3 Application
Lighting-management for mobile telephones and
other 1-cell Li+ or 3-cell NiMH powered devices.
www.austriamicrosystems.com/AS3687
(mlg/ptr)
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1 page  
AS3687/87XM
Datasheet
5 Characteristics
5.1 Absolute Maximum Ratings
Stresses beyond those listed in Table 1 may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated in Section 5
Electrical Characteristics is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table 1 – Absolute Maximum Ratings
Symbol
Parameter
VIN_HV
15V Pins
Min
-0.3
VIN_MV
5V Pins
-0.3
VIN_LV
IIN
Tstrg
3.3V Pins
Input Pin Current
Storage Temperature Range
Humidity
VESD
Electrostatic Discharge
Norm: MIL 883 E Method 3015
VCDM
Pt
TBODY
Norm: JEDEC JESD 22-A115-A
level A
Total Power Dissipation
Peak Body Temperature
-0.3
-25
-55
5
-2000
-1000
-500
Max
17
7.0
5.0
+25
125
85
2000
1000
500
0.75
260
Unit
V
V
V
mA
Note
Applicable for high-voltage
current sink pins CURR1,CURR2,
CURR6
Applicable for 5V pins
VBAT, CURR30-33,
CURR33/AUDIO_IN, C1_N, C2_N,
C1_P, C2_P, CPOUT, DCDC_FB,
DCDC_GATE, CLK, DATA;
Applicable for 3.3V pins
V2_5; DCDC_SNS
At 25ºC, Norm: JEDEC 17
°C
% Non-condensing
V
All pins except
CURR33/AUDIO_IN
V Pin CURR33/AUDIO_IN
V
W TA = 70 ºC, Tjunc_max = 125ºC
°C
T = 20 to 40s, in accordance with
IPC/JEDEC J-STD 020.
5.2 Operating Conditions
Table 2 – Operating Conditions
Symbol
Parameter
VHV High Voltage
VBAT
VDDI/F
V2_5
TAMB
Battery Voltage
Interface Supply Voltage
Voltage on Pin V2_5
Operating Temperature Range
IACTIVE
Battery current
ISTANDBY
ISHUTDOWN
Standby Mode Current
Shutdown Mode Current
Min Typ Max Unit
Note
Applicable for high-voltage current
0.0 15.0 V sink pins CURR1, CURR2 and
CURR6.
3.0 3.6 5.5 V VBAT
1.5 1.8 / 2.8 5.5
V For serial interface pins.
2.4 2.5 2.6 V Internally generated
-30 25
85 °C
Normal Operating current – see
70
µA
section ‘Operating Modes’;
interface active (excluding current
of the enabled blocks)
Current consumption in standby
5.8 13 µA mode. Only 2.5V regulator on,
interface active
0.1
3
µA
interface inactive (CLK and DATA
set to 0V)
www.austriamicrosystems.com/AS3687
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5 Page 
AS3687/87XM
Datasheet
R2 = Feedback resistor R2.
R3 = Feedback resistor R3.
IDCDC_FB = Tuning current at pin 29 (DCDC_FB); 0 to 31µA.
Table 4 – Voltage Feedback Example Values
Ivtuning
µA
0
Ustepup_out
R2 = 1MΩ, R3 not used
-
1-
2-
3-
4-
5 6.25
6 7.25
7 8.25
8 9.25
9 10.25
10 11.25
11 12.25
12 13.25
13 14.25
14 15.25
15 16.25
……
30 31.25
31 32.25
Ustepup_out
R2 = 500kΩ, R3 = 50kΩ
13.75
14.25
14.75
15.25
15.75
16.25
16.75
17.25
17.75
18.25
18.75
19.25
19.75
20.25
20.75
21.25
…
28.75
29.25
Caution: The voltage on CURR1, CURR2 and CURR6 must not exceed 15V – see also section ‘High
Voltage Current Sinks’.
7.1.4 PCB Layout Hints
To ensure good EMC performance of the DCDC converter, keep its external power components C2, R2, L1, Q1,
D1 and C9 close together. Connect the ground of C2, Q1 and C9 locally together and connect this path with a
single via to the main ground plane. This ensures that local high-frequency currents will not flow to the battery.
7.1.5 Step up Registers
Addr: 00
Reg. Control
This register enables/disables the Charge Pump and the Step Up DC/DC Converter
Bit Bit Name
3 step_up_on
Default
0
Access
R/W
Description
Enable the step up converter
0b = Disable the Step Up DC/DC Converter.
1b = Enable the Step Up DC/DC Converter.
www.austriamicrosystems.com/AS3687
1v3-4
11 - 54
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3687XM.PDF ] | |
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