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EM6420 Schematic ( PDF Datasheet ) - EM Microelectronic

Teilenummer EM6420
Beschreibung Ultra Low Power Capacitive Touch Sensor Interface IC
Hersteller EM Microelectronic
Logo EM Microelectronic Logo 




Gesamt 30 Seiten
EM6420 Datasheet, Funktion
EM MICROELECTRONIC - MARIN SA
EM6420www.DataSheet4U.com
Ultra Low Power Capacitive Touch Sensor Interface IC
Description
The EM6420 is an ultra low power Touch Sensor Interface
IC able to scan sequentially up to 16 capacitive sensors.
The device parameters (number of used sensors, sensors
scan frequency, sensors sensitivity level, IRQ condition)
are configurable either from a host microcontroller through
a communication port or through configuration inputs.
Recognised touch inputs will be signaled with an active
edge at the IRQ pad and data are ready to be read through
the communicaion port by the host MCU. Conditions for the
IRQ to get active are configurable : at the end of every
scan, at the end of a scan if at least one sensor is active or
at the end of a scan if the sensors state has changed.
The EM6420 can also detect the most active sensor in
applications where sensors are tightly spaced. It compares
relative levels among sensors and selects the sensor with
the largest signal strength.
To increase the number of sensors >16, use several
EM6420 in parallel.
Depending on the selected supply voltage range, 3 or 4
decoupling capacitors are required for the entire
functionality of the EM6420 from -40 to + 85°C.
Features
Up to 16 analogue sensor inputs
User selectable communication interfaces : 4-wire SPI,
I2C, 4-bit parallel interface and 8-bit direct output
User-selectable active edge IRQ output signal
Active high enable input
No software development and tuning required
Development tools and documentations available
Complete touch module available: IC + electrodes
design on various non-conductive substrates
Electrical Characteristics
Supply voltage
Power consumption
Low Power Mode
Ultra Low Power
Mode
1.2 V to 2.0 V or 2.2 to 3.6 V
8.0 µA @ 3.0 V (14.5 µA
@1.5 V) for 16 sensors
scanned at 8 Hz
2.0 µA @ 3.0 V (5.0 µA
@1.5 V) for 16 sensors
scanned at 8 Hz
Nominal sensor
capacitance
3 to 31 pF
Sensors
frequency
scan
1 Hz to 128 Hz *frequency
depending on number of
sensors
COM clock frequency up to 400 kHz
Availability
Naked die
SMT package MLF32-36-40
Design Considerations
The EM6420 is well suited for battery and mains powered
applications where the following features are important :
Tamper proof applications
Nice and clean designs
Touch function to avoid buttons and keys
Slider functions
Hygienic issues, cleaning aspects
Waterproof designs
Applications
Mobile phones, cordless phones
PDA, keyboards
White & brown goods
Toys
Lighting - Sliders for dimming
Copyright 2010, EM Microelectronic-Marin SA
6420-DS.doc, Version 2.0, 10-Jun-10
1
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EM6420 Datasheet, Funktion
EM6420www.DataSheet4U.com
3. FEATURES
3.1 KEY ELEMENTS
Ultra low power and ultra low voltage Touch Screen interface
Up to 16 sensor inputs per device
Increased number of sensors can be addressed with more devices in parallel
User selectable power supply range (see below)
User-selectable active edge IRQ output signal
User-selectable communication interface (see below)
Active high enable input
Maximum 4 external components needed (decoupling capacitors only)
No software development or tuning required
3.2 POWER SUPPLY
Low supply voltage range : 1.2 V to 2.0 V
High supply voltage range : 2.2 V to 3.6 V
Disabled Mode consumption : IDD Disabled < 50 nA
IDD = 8.0 µA @ 3.0 V (14.5 µA @ 1.5 V ) for 16 sensors scanned at 8 Hz in Low Power Mode
IDD = 2.0 µA @ 3.0 V (5.0 µA @ 1.5 V ) for 16 sensors scanned at 8 Hz in Ultra Low Power Mode
IDD = 5.0 µA @ 3.0 V (9.0 µA @ 1.5 V ) for 8 sensors scanned at 2 Hz in Low Power Mode
IDD = 0.7 µA @ 3.0 V (1.2 µA @ 1.5 V ) for 8 sensors scanned at 2 Hz in Ultra Low Power Mode
Internal voltage regulator for logic supply when used in high supply voltage range
Internal voltage multiplier for analog supply when used in low supply voltage range
Internal voltage regulator for analog supply
3.3 INTERFACES
4-wire SPI
I2C (Standard-Mode or Fast-Mode compatible)
4-bit parallel interface
8-bit direct output (Standalone Mode)
3.4 DEVELOPMENT TOOLS
EM6420 starter kit with its related documentation
Ultra low power User Interface reference design with EM6420-based Touch solution, EM6110 LCD
driver and EM6819 host MCU
3.5 TOUCH MODULES BASED ON EM6420 IC
Capacitive electrodes design capability on various non-conductive substrates (according
customer's requirements)"
Transparent / Invisible electrodes possible
Application-specific touch modules development: contact EM-Microelectronic HQ
Copyright 2010, EM Microelectronic-Marin SA
6420-DS.doc, Version 2.0, 10-Jun-10
6
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EM6420 pdf, datenblatt
EM6420www.DataSheet4U.com
Parameter
Operating temperature
Low supply voltage range
High supply voltage range
Reference terminal
Regulated voltage VDDD capacitor
Regulated voltage VDDA capacitor
Unregulated voltage VCP buffer capacitor
Voltage multiplier booster capacitor
Conditions
6.5 DC CHARACTERISTICS POWER SUPPLY
Symbol
TOp
VDDL
VDDH
VSS
CVDDD
CVDDA
CVCP
CB
Min
-40
1.2
2.2
100
Conditions unless otherwise specified : VDD = 3.0 V, T = 25°C
Parameter
Conditions
Supply voltage
Disable mode current consumption3
T = -40 to +85°C
En input connected to VSS
Sleep mode current consumption
Active mode current consumption
Touch Screen OFF
Symbol
VDD
IDD_Dis
IDD_Slp
IDD_RUN
Min
2.2
Typ.
0
22
100
47
Typ.
3.0
2
470
7.5
Max
85
2.0
3.6
470
Units
°C
V
V
V
nF
nF
nF
nF
Max
3.6
10
580
9.5
Units
V
nA
nA
µA
Conditions unless otherwise specified : VDD = 1.5 V, T = 25°C
Parameter
Conditions
Supply voltage
Disable mode current consumption4
T = -40 to +85°C
En input connected to VSS
Sleep mode current consumption
Active mode current consumption
Touch Screen OFF
Symbol
VDD
IDD_Dis
IDD_Slp
IDD_RUN
Min
1.2
6.6 POR
Conditions unless otherwise specified : VDD = 1.5 V, T = 25°C
Parameter
Conditions
High threshold voltage
Threshold voltage hysteresis
Symbol
VIH_POR
VHys_POR
Min
0.75
50
Typ.
1.5
2
380
12.0
Typ.
0.90
Max
2.0
10
530
16.5
Units
V
nA
nA
µA
Max
1.10
110
Units
V
mV
3 This value is guaranteed by design
4 This value is guaranteed by design
Copyright 2010, EM Microelectronic-Marin SA
6420-DS.doc, Version 2.0, 10-Jun-10
12
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