Document
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Automotive Entertainment
& Navigation
Will Zhang
High Performance Analog
Texas Instruments Semiconductor
Technologies (Shanghai)
Mar.25.2007
1
Diversity of Media Player
Performance
PMP+DVR
Game PMP
PMP
PMP+GPS
Game MP3
HDD
MP3
Video
MP3
MP3
2007
2
WHAT GPS IS
4 GPS:
4 Global Positioning System
4 How it Works:
4 GPS satellites circle the earth twice a day in a very precise orbit
and transmit signal information to earth.
4 GPS receivers take this information and use triangulation to
calculate the user's exact location. Essentially, the GPS receiver
compares the time a signal was transmitted by a satellite with the
time it was received.
4 Distance=Cxdt
4 Distance={（Xs-Xu）2+（Ys-Yu）2+（Zs-Zu)2}1/2
4 t, x, y, z parameters to be determined.
4 4 satellites signal at least
3
GPS Family
GPS Monitor
GPS
GPS Navigator
GPS Timing
4
Block Diagram--GPS Portable Navigator
Audio In
Audio Process
Mix+
Audio Codec
LCD Driver
uP
TFT Video
Display
S3C244x
MSP430
CIR Remote
Control
Power
5V,2A
Audio
OP
IIS/AC97/PCM
GPS Module
UI
Audio out:
HP: Stereo
Spk: Mono
T/S
3.5” T/S panel
Power Manager
System Power
AFE GAUGE
Lithium Battery
SDRAM
64MB
Flash
64 MB
USB 2.0
Client
Memory Storage
SD Card
Socket
5
GPS –Signal Chain
Centrality Atlas Family
UART
BT
Transceiverr
Atlas
PCM
GPS Base Band
GPS
Receiver
UART
ARM 9
Processor
Go Back
Must Have
TSC
TSC2005
I2S
Codec
AIC32
APA
TPA2012D2
Optional
6
GPS –Signal Chain
Go Back
Must Have
7
Power Architecture of GPS
Down
Converter
5v
LED
Back light
Charger
30V@20mA
LED
Backlight
Bq24070
14.4V+40V Peak
Audio
Amplifier
1 Li+
Cell
3.3V@600mA
Digital I/O
DC-DC
Vmain
TPS6202x
Bias
Regulator
TPS6202x
PMU: TPS6505x
Vgh
Vgl
TFT Panel
TPS65120
1.3V@600mA TPS65150
DC-DC
Vcore
TPS730xx
2.5V@0.3A
Vram
LDO
TI Parts
TPS717xx
On/off
Reset
3..0V@ 0.3A
LDO
RF Module
8
Power for GPS
9
Automotive Power Environment
Voltage Transition
10
Automotive Power Design
Voltage Rating: 36V，Transient >40V，
12V System 60V~80V@100ms
24V System 80~100V@100ms
Choker in series 、Bulb Capacitor Buffered
Fast Response
Other Requirements
Minimize components number，
Anti-shock
-40~+85C
Minimize soldering，
Anti-thermal shock
Soldering, Pad as big as possible
Minimize heat dissipation
Standby Current<1mA
Considering portable application always
11
Power Design for GPS
Low EMI
RF Front-end: -159db Receiving environment
Low Heat Dissipation
Minimize Temp Drift
Dynamic Voltage Control Preferred
Minimize power consumption during media playing
Maximize performance during navigation
12
GPS Charger, Always Charging?
+
Adapter
or USB
Charger
ISYS
IBAT
System
Current (A)
ICHG
1
0.8
ICHG
IBAT
0.6
0.4
0.2
ISYS
ITERM
0
当充电芯片在恒压模式时：
1. 充电电流将逐步降低
2. 系统用电超过设定的终止电流监测阈值old
3. 充电芯片稳定在设定的电压上,但 ICHG > ITERM
20
¾ 检测不到终止
¾ 安全定时器溢出
Solution:
关闭定时器或考虑外加分流电路为系统供电
13
40
60 80
Time
Power Path: Potential Issue
IADP
Adapter
+
Q1
Controller
VOUT
System Current
ISYS
System Current
ICHG
ISYS
Q2
IBAT
C1
System
IADP
Charging
Battery
Adapter current limit
Input current : IADP = IBAT + ISYS
Adapter
voltage
collapses
-
VADP
Issues:
• Input voltage collapses
Time
14
Dynamic Power Path Manag’ t(DPPM)
IADP
+
Adapter
or USB
Output
Control
Current
Control
ISYS
ISYS
DPPM
Mode
IADP
AC adapter current limit
Q2
ICHG
C1
System
当(Isys + Ichg) > IAC_LIMIT外部电压下降
太大的瞬间系统电流将导致外部供电电压明显的跌
落，从而导致系统复位或性能下降
ICHG
DPPM ：
当供电电压低于设定值的时候， 减小充电电流 “发现”
交流适配器的最大电流 !!!
电池补充模式
System Voltage
VDPPM
VBAT
Time
15
BQ24070—DPPM Charger Management
26V Hi Voltage
• 交流适配器或 USB 可以在给系统供电，同时充电：
•节省两个MOSFET和电压监测器
• 更小的，更低成本的交流适配器
• 给系统提供经过稳压的供电
• 减少了内部DC-DC和外部高电压的接触，提高可靠性，降低了成本
• 延长了电池的寿命和安全性
16
TPS65050
Dual Step-down converter with 4LDOs
TPS65050
TPS65050
DCDC1 externally adjustable
DCDC1 output current: 600mA
DCDC2 externally adjustable
DCDC2 output current: 600mA
LDO voltage selectable with
DEFLDOx pins according to
table A
Output cap discharge for LDOs
PB_ONOFF functionality
4mm x 4mm 32-Pin QFN
package 0.4mm pitch
VINDCDC1/2
1R
Vbat
VCC
10uF
1uF
2.2uH
DCDC1 (I/O)
L1
STEP-DOWN
CONVERTER
600mA
FB_DCDC1
EN_DCDC1
ENABLE
MODE
DEFLDO1
DEFLDO2
DEFLDO3
DEFLDO4
PGND1
R1
Cff
10uF
R2
Interface
L2
DCDC2 (core)
STEP-DOWN
CONVERTER
600mA
EN_DCDC2
ENABLE
VLDO2
EN_LDO2
ENABLE
PGND2
VIN_LDO3/4
VLDO3
ENABLE
ENABLE
R4
4.7uF
VLDO2
4.7uF
400mA LDO
VIN
10uF
400mA LDO
VIN_LDO2
VIN
R3
DEFDCDC2
VLDO1
EN_LDO1
ENABLE
2.2uH
VLDO1
VIN_LDO1
VIN
VDCDC2
EN_LDO3
200mA LDO
EN_LDO4
VLDO4
VLDO3
2.2uF
BP
0.1uF
VLDO4
2.2uF
200mA LDO
I/O voltage
Vbat
PB_IN
Flipflop with
32ms debounce
default
turned on
AGND
17
PB_OUT
R19
TPS65050
Dual Step-down converter with 4LDOs
PREVIEW
TPS65050-LDO voltages table A
DEFLDO1
DEFLDO2
DEFLDO3
DEFLDO4
VLDO1
VLDO2
VLDO3
VLDO4
400mA LDO
400mA LDO
200mA LDO
200mA LDO
1.8V- 5.5V
Input
1.8V- 5.5V
Input
1.5V-5.5V
Input
1.5V-5.5V
Input
3.3V
3.3V
1.85V
1.85V
3.3V
3.3V
1.5V
1.5V
3.3V
2.85V
2.85V
2.7V
3.3V
3.3V
2.85V
2.85V
2.85V
2.85V
2.5V
1.85V
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
3.3V
3.3V
2.85V
2.85V
1.85V
1.5V
1.85V
1.5V
0
1
1
1
3.3V
2.85V
1.5V
1.3V
1
0
0
0
3.3V
2.85V
1.1V
1.3V
1
0
0
1
2.85V
2.85V
1.85V
1.85V
1
0
1
0
1
0
1
1
2.7V
2.5V
3.3V
3.3V
1.2V
1.5V
1.2V
1.5V
1
1
0
0
2.5V
3.3V
1.5V
1.3V
1
1
0
1
1
1
1
0
1.85V
1.8V
1.85V
2.5V
1.35V
3.3V
1.35V
2.85V
1
1
1
1
1.2V
1.8V
1.1V
1.3V
18
TPS65051
Dual Step-down converter with 4LDOs
TPS65051
VINDCDC1/2
1R
Vbat
VCC
2.2uH
1uF
TPS65051
DCDC1 externally adjustable
DCDC1 output current: 1A
DCDC2 externally adjustable
DCDC2 output current:
600mA
LDO externally adjustable
Output cap discharge for
LDOs
Reset (/Respwron) with
adjustable threshold and
hysteresis
4mm x 4mm 32-Pin QFN
package 0.4mm pitch
ENABLE
MODE
EN_DCDC1
DCDC1 (I/O)
L1
STEP-DOWN
CONVERTER
1A
FB_DCDC1
R1
22uF
Cff
10uF
R2
PGND1
MODE
L2
DCDC2 (core)
ENABLE
VIN
ENABLE
VIN
ENABLE
STEP-DOWN
CONVERTER
600mA
EN_DCDC2
VDCDC2
2.2uH
R3
10uF
DEFDCDC2
PGND2
R4
VLDO1
VIN_LDO1
VLDO1
FB1
EN_LDO1
400mA LDO
VIN_LDO2
VLDO2
EN_LDO2
400mA LDO
R5
4.7uF
R6
VLDO2
FB2
R7
4.7uF
R8
VIN
ENABLE
VIN_LDO3/4
VLDO3
EN_LDO3
200mA LDO
VLDO3
FB3
BP
R9
2.2uF
R10
0.1uF
ENABLE
VLDO4
EN_LDO4
200mA LDO
VLDO4
FB4
R11
R12
2.2uF
I/O voltage
R19
/RESET
THRESHOLD
HYSTERESIS
RESET
AGND
19
TPS65052
Dual Step-down converter with 4LDOs
PREVIEW
TPS65052
VINDCDC1/2
1R
TPS65052
DCDC1 fixed at 3.3V
DCDC1 output current: 1A
DCDC2 fixed at 1.0V / 1.3V
DEFDCDC2 = low: 1.0V
DEFDCDC2 = high: 1.3V
DCDC2 output current: 600mA
Samsung processor compatible
LDO voltage selectable with
DEFLDOx pins according to
table A
Output cap discharge for LDOs
Reset (/Respwron) with
adjustable threshold and
hysteresis
4mm x 4mm 32-Pin QFN
package 0.4mm pitch
Vbat
VCC
10uF
1uF
ENABLE
MODE
DEFLDO1
DEFLDO2
DEFLDO3
DEFLDO4
ENABLE
1.0V / 1.3V
VIN
ENABLE
VIN
ENABLE
VIN
ENABLE
ENABLE
2.2uH
DCDC1 (I/O)
L1
STEP-DOWN
CONVERTER
1A
FB_DCDC1
EN_DCDC1
10uF
PGND1
Interface
L2
DCDC2 (core)
STEP-DOWN
CONVERTER
600mA
EN_DCDC2
DEFDCDC2
VDCDC2
2.2uH
10uF
PGND2
VLDO1
VIN_LDO1
VLDO1
EN_LDO1
4.7uF
400mA LDO
VIN_LDO2
VLDO2
EN_LDO2
VLDO2
4.7uF
400mA LDO
VIN_LDO3/4
VLDO3
EN_LDO3
200mA LDO
EN_LDO4
VLDO4
VLDO3
2.2uF
BP
0.1uF
VLDO4
2.2uF
200mA LDO
I/O voltage
R19
/RESET
THRESHOLD
HYSTERESIS
RESET
AGND
20
TPS65054
Dual Step-down converter with 4LDOs
PREVIEW
TPS65054
VINDCDC1/2
1R
Vbat
VCC
2.2uH
1uF
TPS65054
DCDC1 externally adjustable
DCDC1 output current:
600mA
DCDC2 fixed to 1.05V / 1.3V
DEFDCDC2 = low: 1.3V
DEFDCDC2 = high: 1.05V
DCDC2 output current:
600mA
OMAP1710 compatible
LDO externally adjustable
Reset (/Respwron) with
adjustable threshold and
hysteresis
4mm x 4mm 32-Pin QFN
package 0.4mm pitch
ENABLE
MODE
EN_DCDC1
DCDC1 (I/O)
L1
STEP-DOWN
CONVERTER
600mA
FB_DCDC1
R1
22uF
Cff
10uF
R2
PGND1
MODE
L2
DCDC2 (core)
ENABLE
1.3V / 1.05V
VIN
ENABLE
VIN
ENABLE
STEP-DOWN
CONVERTER
600mA
EN_DCDC2
DEFDCDC2
VDCDC2
2.2uH
10uF
PGND2
VLDO1
VIN_LDO1
VLDO1
FB1
EN_LDO1
400mA LDO
VIN_LDO2
VLDO2
EN_LDO2
400mA LDO
R5
4.7uF
R6
VLDO2
FB2
R7
4.7uF
R8
VIN
ENABLE
VIN_LDO3/4
VLDO3
EN_LDO3
200mA LDO
VLDO3
FB3
BP
R9
2.2uF
R10
0.1uF
ENABLE
VLDO4
EN_LDO4
200mA LDO
VLDO4
FB4
R11
R12
2.2uF
I/O voltage
R19
/RESET
THRESHOLD
HYSTERESIS
RESET
AGND
21
TPS65056
Dual Step-down converter with 4LDOs
TPS65056
VINDCDC1/2
1R
Vbat
VCC
2.2uH
1uF
TPS65056
DCDC1 fixed at 3.3V
DCDC1 output current: 1A
DCDC2 fixed at 1.0V / 1.3V
DEFDCDC2 = low: 1.0V
DEFDCDC2 = high: 1.3V
DCDC2 output current: 600mA
Samsung processor compatible
LDO voltage externally
adjustable
Output cap discharge for LDOs
Reset (/Respwron) with
adjustable threshold and
hysteresis
4mm x 4mm 32-Pin QFN
package 0.4mm pitch
ENABLE
MODE
EN_DCDC1
DCDC1 (I/O)
L1
STEP-DOWN
CONVERTER
1A
FB_DCDC1
22uF
10uF
PGND1
MODE
L2
DCDC2 (core)
ENABLE
1.0V / 1.3V
VIN
ENABLE
VIN
ENABLE
STEP-DOWN
CONVERTER
600mA
EN_DCDC2
DEFDCDC2
VDCDC2
2.2uH
10uF
PGND2
VLDO1
VIN_LDO1
VLDO1
FB1
EN_LDO1
400mA LDO
VIN_LDO2
VLDO2
EN_LDO2
400mA LDO
R5
4.7uF
R6
VLDO2
FB2
R7
4.7uF
R8
VIN
ENABLE
VIN_LDO3/4
VLDO3
EN_LDO3
200mA LDO
VLDO3
FB3
BP
R9
2.2uF
R10
0.1uF
ENABLE
VLDO4
EN_LDO4
200mA LDO
VLDO4
FB4
R11
R12
2.2uF
I/O voltage
R19
/RESET
THRESHOLD
HYSTERESIS
RESET
AGND
22
TPS65053
Dual Step-down converter with 3LDOs
PREVIEW
TPS65053
VINDCDC1/2
1R
TPS65053
DCDC1 externally adjustable
DCDC1 output current: 600mA
VCC
1uF
DCDC1 (I/O)
ENABLE
EN_DCDC1
STEP-DOWN
CONVERTER
600mA
MODE
FB_DCDC1
R1
PGND1
R2
optionally: 1A
DCDC2 externally adjustable
DCDC2 output current: 600mA
3LDOs
LDO1, 400mA, externally
adjustable
LDO2, 200mA, externally
adjustable
LDO3, 200mA, fixed voltage
TBD
threshold input and /Reset
output
4mm x 4mm QFN package,
0.5mm pitch, 24pins
Cff 10uF
2.2uH
DCDC2 (core)
ENABLE
EN_DCDC2
STEP-DOWN
CONVERTER
600mA
DEFDCDC2
optionally: 1A
22uF
2.2uH
L1
VIN
ENABLE
VIN
ENABLE
VIN_LDO1
VLDO1
EN_LDO1
400mA LDO
L2
FB_DCDC2
PGND2
R3
Cff 10uF
R4
VLDO1
FB1
R5
4.7uF
R6
VIN_LDO2/3
VLDO2
EN_LDO2
200mA LDO
VLDO2
FB2
R7
2.2uF
R8
ENABLE
EN_LDO3
VLDO3
VLDO3
2.2uF
200mA LDO
I/O voltage
THRESHOLD
/Reset
RESET
AGND
23
R19
TPS6512x 1Inductor，4outputs
• Main Output, VMAIN
Adjustable Voltage from 3.0V to
5.6V @ 20mA max.
Post-Regulated for Low Ripple
Noise (5mV)
±0.8% Typical Accuracy
Efficiency up to 83%
• Positive / Negative Gate Voltage
Outputs, VGH / VGL
Adjustable Voltage Up To +20V / 18V @ 2mA
±3% Typical Accuracy
• Auxiliary 1.8V / 3.3V Linear
Regulator
• Automatic or Programmable OutputSequencing
• No forward leakage
• Output Short-Circuit Protected
•
•
•
•
•
•
Ultra-small solution
Fewest External components
easy to implement
High accuracy for best picture quality
High efficiency extends battery life
High Reliability
small inductor
(1608 case size)
QFN-16
3x3x0.9mm3
24
No CFF
required
small
caps
GPS – Power Chain
P/N
RTM
*Automotive Catalog; Qualified for Automotive Applications
Description
Li+ Charger
BQ24032A/70
Now
Dual/Single input 1-cell (4.2V) Li-Ion Charger w/ Power Path
Now
Single Inductor Quad output SFF TFT LCD Panel Bias
TPS6505x
Now
Dual buck+4LDO+1POR+On-off
TPS62400
Now
Dual Buck
Now
150mA, superhigh PSRR RF LDO
Now
1A Boost from 3.6V to 5V for USB host and 2W audio
Panel Bias
TPS65120
Buck
LDO
TPS717
Boost
TPS61027
25
Audio Design for GPS
26
Audio Design Highlight
High Volume During Navigation
Audio Performance conflict with RF Design
Small signal layout
Clock jitter
High Performance Act as Media Player
Spk: Mono, H/P: stereo
27
Audio Codec : TLV320AIC32
• 14mW stereo 48ksps playback
• Stereo DAC 8-96ksps 100dB SNR !
Stereo ADC 8-96 ksps 92dB SNR !
• Programmable digital audio processor
• Six single-ended microphone or line inputs
• Integrated microphone bias, preamp, AGC
• Integrated phase locked loop
• Speaker & cap-free headphone drivers
• Audio interface: I2S, DSP and TDM
Control interface: I2C
• Ultra low power for extended battery run time
• Ultra low noise for excellent audio quality
•
•
•
•
•
•
3D, bass, treble, EQ, and de-emphasis effects
Conversion Rate Change
Seamless interface to electret microphones
No ext crystal required, use 512kHz-50MHz input clks
High integration - fewer external components
Flexible interfaces and ability to multiplex devices
• 5mm x 5mm 32-pin QFN (RHB)
ADC
Single-Ended
Single-Ended
DAC
Volume
Control
Equalizer
Audio Effects
ADC
DAC
3D
Single-Ended
Single-Ended
PLL
Control Bus
Differential
or
Single-Ended
Differential
or
Single-Ended
Headphone
Speaker
Power Supply Voltages
Analog: 2.7 – 3.6V
Digital Core: 1.525 – 1.95V
Digital I/O: 1.1 – 3.6V
Differential
Single-Ended
Mixer
Mic or Line
Inputs
• MP3/PMP/GPS/PDA/Cell phones
Audio Bus
Stereo
Line-outs
Mic or Line
Inputs
• Small footprint, saving board space and cost
28
TSC2101-- Touch Screen Controller & Audio Codec
Key Features
4
4
4
4
4
Temp Msmt
AUX Msmt
Battery
Bias
PGA/AGC
Mono
ADC
Mic (x2)
Headphones
SAR
ADC
SPI Port
4
4
support rates up to over 50ksps
400mW Mono BTL 8 Ω speaker amplifier
40mW Stereo 16Ω headphone amplifiers
with cap-less interface support
Dual Mic Inputs with bias, preamp, AGC
Programmable PLL for flexible audio clock
generation
Programmable digital audio
Bass/Treble/EQ/De-emphasis
On-chip 12-Bit SAR ADC for
Battery/Temp/Aux Measurement
4-Wire Intelligent Touch Screen Controller
TSC2101
Touch
Screen
VCM
Stereo
DAC
CPU
I2S Port
4 98dB Stereo Audio DAC, mono Audio ADC
PLL
8Ω Spkr
Key Differentiators
7 Analog Inputs, 4 Analog Outputs, 3 Amps
H/S Auto
Detect
19 mW Stereo Playback at 48 ksps
48-lead 7x7mm QFN
1ku price - $4.95
29
Audio Power Amp: TPA203xD1
Packaging
4 ~1.5x1.5mm WCSP (YZF) [Pb-Free]
PVDD
Internal
Oscillator
VDD
INPulse
Width
Modulator
Differential
Input
Grain of rice
TPA203xD1
IN+
SHUTDOWN*
VoH-Bridge
Vo+
Bias
Circuitry
PGND
GND
WCSP
(Top view of PCB)
1.8V Low-Voltage Logic
VIH and VIL Levels
Integrated
300KΩ Pull-down Resistor
Features
4
4
4
4
4
4
4
4
4
Benefits
Fixed Gain of: 2V/V, 3V/V, or 4V/V
Only 1 external component required
Fully differential, Filter-Free Class-D amplifier
2.5 W into 4Ω at 5V
Supply Voltage: 2.5 to 5.5 V
~84dB PSRR (estimated #)
~75dB Ksvr at 217Hz (estimated #)
Smallest available packaging option
No input coupling caps required
4
4
4
4
4
4
4
Almost a drop in replacement for TPA2010D1
Longer battery life compared to class-AB
Reduces RF rectification
No LC Filter required
Direct-Connect to battery
4 More power
4 Higher efficiency
Saves board space
Reduces external components
30
HOME
Audio Power Amp: TPA2013D1
R1
1.6 to 5.5V
To Battery
Vdd SW
FB VccOUT VccIN
1nF
CIN
Differential
Input
GPIO
Vout+
ININ+
Vout-
4
4
4
4
4
4
4
4
FERRITE
1nF
Gain
ShutDown Boost
SDZb
ShutDown ClassD
SDZd
GND
PGND
Features
4
FERRITE
TDK
MPZ1002S121
1uF
CIN
Gain (Vcc/GND/float)
4
1uF
22uF
Coilcraft
4.7uH
DO3314-472MX
10uF
4
Packaging
4 ~2.4x2.4mm WCSP (YZH) [Pb-Free]
R2
High Output Power from Low Voltage Supply
1.8W @ 3.6V into 8Ω load
1.6 to 5.5V supply Voltage
90dB KSVR at 217Hz
High Power with High Efficiency ~80%
Combines Parts needed for High Power Solution
Very High PSRR
Standby low power mode
Very small WCSP packaging
Internal gains of 2V/V, 6V/V, and 10V/V
Independent shutdown control for the class D
and boost converter
Benefits
4
4
4
4
4
4
4
4
No extra High Voltage Supply Rail Required
Longer battery life
Fewer silicon component solution
Direct Battery Connect
Lower battery power consumption when idle
No LC filter required
Independent boost converter can drive external
components that require high voltage
Small total solution size (~6.5 x 6.5 mm)
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HOME
TPA2005D1
1.4W into 8Ω Class-D
RI
Differential
Input
RI
IN-
PWM
Packaging
VDD to Battery
Internal
Oscillator
2.5x2.5mm BGA (GQY) [Pb]
4 2.5x2.5mm BGA (ZQY) [Pb-Free]
4 3x3mm QFN (DRB)
4
CS
HVo+
Bridge
Vo-
IN+
GND
SHUTDOWN
Bias
Circuitry
Filter-Free Class D
Features
4 580 mW into 8Ω at 3.6V
4 Supply Voltage: 2.5 to 5.5 V & ~75dB
4
4
4
4
PSRR
Filter-Free modulation
No input coupling caps
Fully differential amplifier
Pin Pin Compatible to
TPA6204D1(1.7W), TPA6211D1(3.1W)
in QFN
Benefits
4
Longer battery life compared to class-AB
Powers hands-free mode
Direct-Connect to battery
4 More power
4 Even higher efficiency
Saves board space
Only 3 external components
4
Reduces RF rectification
4
4
4
4
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Audio Power Amp: EMI?
CC
F
ses
s
a
P
CE
d
an
-B
s
s
cla
EMI measured in 3m chamber
1cm speaker wire
5cm power supply wire
8 ohm load
3.6V LiIon battery
500mW output power
Little to no radiation at 1.7GHz and above
33
TSC2003 Touch Screen Controller
4-wire Touch Screen Controller Similar to ADS7846, Only I2C Interface
• I2C Simplifies Processor Interface
providing low cost and small size
• Supports full I2C standards
• Low power consumption
• Direct battery Monitoring
• Ratiometric conversion
eliminates gain & offset errors
• Supports Pressure &
Temperature Measurement
•WinCE Driver
Support!
1S Startup
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Benefit of 1S Startup
Minimize the risk during reading/writing flash
memory
Minimize the waiting time during on/off
Improve end user experience
Friendly environment for open operation system
Easily install/remove software
Fast operation
No firmware issue
36
关机/开机处理
1. MCU监测到关机信号
切断外围电路供电：GPS, Audio, 屏幕等
数据保持标志位置1
SDRAM进入 Self-refresh模式
主时钟停振（实时时钟保持）
关闭DC-DC,改用LDO供电维持系统运行
开机触发键唤醒
中断处理程序—主振启动，SDRAM进入活动模式
检查数据保持标志位决定是否跳过初始化
是， 距离上次关机4小时以内，开启外围模块供电
1S启动完成
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1S启动主要开销
维持关机状态下的耗电
CPU漏电
SDRAM耗电
DC-DC或LDO耗电
MCU或RTC耗电
外围I/O漏电
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主要漏电计算
CPU及外设I/O漏电：100uA
RTC or MCU, 30uA
RAM: 200uA~600uA
LDO/DC-DC
110uA/channel LDO， 3通道约330uA
DC-DC, 16uA~600uA, 2通道，约1200uA
最差合计：2260uA
最佳合计：462uA
电池容量1800mAh, 3.0V后约5%即90mAh, 最佳情况下可以保持
190小时，最差情况下约40小时
39
Thanks for your time !
www.ti.com.cn
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