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Release Date: Sep. 27, 2013 - 1 - Verision: A6.0 1. GENERAL DESCRIPTION The N55T10 is a general purpose capacitive touch sensor to co-work with other general micro- processors through serial interface. One N55T10 can support up to 10 sensor pads. Each pad equips with environment adaptive calibration function to prevent false trigger . The N55T10 features serial interface to communicate with master microprocessor to receive command /configuration from master and deliver touch sensor pad status to master chip. The N55T 10 provides stand-by mode to minimize the po wer consumption and all touch sensor pads can be waked up under low stand-by current. Part number Sensor pads Wake up Serial Interface Auto Calibration N55T10 10 V V V
Release Date: Sep. 27, 2013 - 2 - Verision: A6.0 2. FEATURES Wide range of operating voltage: 2.1~5.5V Built-in oscillator Built-in regulator Operating modes: Normal mode and Stand-by mode Max 10 touch sensor pads Any sensor pad can be configured to wake up Configurable less number of sensor pads to speed up response time Key lock release feature Reset management Power-on reset Reset command from Master Chip 1Standby current : 10uA@3V, 10 sensor pads Operating current : 500uA@3V, 10 sensor pads The sensor function still can work while one speaker connecting to the same power supply is playing. Support development system Configuration emulator with USB port Configuration tool for developing parameters easily 1 The Standby current depends on the number of active sensor pads.
Release Date: Sep. 27, 2013 - 3 - Verision: A6.0 3. BLOCK DIAGRAM Analogic Engine Serial Interface Control Logical SClk SD CSCfg Timing Generator Configuration and Algorithm Logic /SInt IP0-IP9 Regulator Regout Rosc Oscillator /Rst Figure 1 N55T10 Block Diagram
3.1 Pin description
ROSC I Ring oscillator resistor pin Vdd Power Power Vss Ground Ground RegOut O Regulator output IP0~IP9 I Cap sensor input pins. SClk I Serial clock SD I/O Serial data /SInt O Serial interrupt to master MCU /RST I Reset pin CSCfg I Chip select configuration pin
Release Date: Sep. 27, 2013 - 4 - Verision: A6.0 4. FUNCTIONAL DESCRIPTION The N55T10 provides up to 10 touch sensor pads. Each touch sensor pad can be configured to be able to wake up or not. There are normal mode and stand-by mode for the chip. In the stand-by mode, chip consumes less current to save power and any sensor pad can be waked up. This chip equips calibration function to adapt to new circumstances to prevent false trigger.
4.1 Serial interface
There are three pins for the serial interface. This chip always act s as a slave chip. There are SClk, SD and /SInt pins. Another MCU will be needed and act as master chip. Master MCU control/configure and gets sensor pad status through the serial interface. 1. SClk always generate from master MCU. 2. SD can be command or parameters from master MCU or sensor pad status from this c hip. 3. /SInt pin act as interrupt pin and will be active wheneve r any of monitored sensor pads status was changed. And /SInt will release once the sensor pads status was read by MCU from serial port.
Release Date: Sep. 27, 2013 - 5 - Verision: A6.0 5. ELECTRICAL CHARACTERISTICS
5.1 Absolute maximum ratings
PARAMETER SYMBOL CONDITIONS RATED VALUE UNIT Power Supply VDDVSS - -0.3 to +7.0 V Input Voltage VIN All Inputs VSS -0.3 to VDD +0.3 V Operating Temp. TOPR - 0 to +70 C Note: Exposure to conditions beyond those listed under the Absolute Maximum Ratings table may adversely affect the life and reliability of the device.
5.2 DC Characteristics
(VDD VSS = 3.0V, TA = 25 C, No Load unless otherwise specified) PARAMETER SYM. CONDITIONS MIN. TYP. MAX. UNIT Operating voltage VDD 2.1 - 5.5 V Input low voltage VIL All Input Pins VSS - 0.3 VDD V Input high voltage VIH All Input Pins 0.7 VDD - VDD V Operating current IOP 10 sensor pads - 500 - uA Standby current ISB 1 sensor pad - 3 - uA 5 sensor pads - 6 - uA 10 sensor pads - 10 - uA 1 sensor pad (VDD=4.5V) - 5 - uA 5 sensor pads (VDD=4.5V) - 10 - uA 10 sensor pads (VDD=4.5V) - 15 - uA Power down current IPD - - 1 uA Pull-high resistor RPH 50 100 200 K
Release Date: Sep. 27, 2013 - 6 - Verision: A6.0
5.3 AC Characteristics
(VDD – VSS = 3.0V, TA = 25C ; unless otherwise specified) PARAMETER SYM. CONDITIONS MIN. TYP. MAX. UNIT External Main Oscillator Frequency Fext Rosc=220Kohm 10 - MHz Frequency Deviation by Voltage Drop External Main Oscillator (Rosc=220K, VReg=2.0V~2.4V) 10 % Sensor pad response time (10 active pads) TRT Standby mode - 310 - ms Sensor pad response time (10 active pads) TRT Normal mode - 100 - ms SCLK FSCLK - - 4 MHz Sync CLK Tsync 1 - - SCLK
Release Date: Sep. 27, 2013 - 7 - Verision: A6.0 6. TYPICAL APPLICATION CIRCUIT 4.7uF U1 N55T10 DIE SD CSCf g IP9 IP7 IP5 IP3 IP1 VSS VDD NC /SInt SClk NC IP8 IP6 IP4 IP2 IP0 /RST RegOut Rosc NC NC 0.1uF VDD 4.7uF GND CONN 6
6 SINT
Connect to configuration USB bridge. Open when N55T10 connects to configuration USB bridge. MCU BP02BP01 VSS Note 1 Note 2: This application circuit illustrates the usage of built-in oscillator, hence the Rosc pin does not need to connect external resistor. Note 2 Note 1: In this application circuit, this IP0 is used to sense environment temperature drop quickly. The control flow of MCU should reset N55T10 once IP0 is active. This methodology can avoid the false trigger due to environment temperature variation quickly. But if the product is not concerned about the environment temperature drop quickly, the IP0 can be used as a sensor pad. SENSOR PAD5 SENSOR PAD2 SENSOR PAD9 SENSOR PAD7 SENSOR PAD8 30pF SENSOR PAD1 SENSOR PAD4 SENSOR PAD3 SENSOR PAD6 0.1uF Figure 2 Application circuit of N55T10
Release Date: Sep. 27, 2013 - 8 - Verision: A6.0 7. REVISION HISTORY REVISION DATE MODIFICATIONS A1.0 October 2009 Preliminary release. A2.0 December 2009 Add touch modes description A3.0 January 2010 Modify the spec for 3 batteries application A4.0 February 2010 Add some features A5.0 March 2010 Confidential release A5.1 May 2010 Add the serial interface AC spec A5.2 May,28 2010 Modify the block diagram Modify the standby current data with different conditions Typ application circuit modify for Regout and CSCfg pin A5.3 Aug, 12 2010 Remove some useless data Modify the standby current data in typical conditions Update the typical application circuit for USB bridge A6.0 Sep, 27, 2013 Update the TYPICAL APPLICATION CIRCUIT. To uniform the terminology to use sensor pads instead of key.
Release Date: Sep. 27, 2013 - 9 - Verision: A6.0 Important Notice Nuvoton Products are neither intended nor warranted for usage in systems or equipment, any malfunction or failure of which may cause loss of human life, bodi ly injury or severe property damage. Such applications are deemed, “Insecure Usage”. Insecure usage includes, but is not limited to: equipment for surgical implementation, atomic energy control instruments, airplane or spaceship instruments, the control o r operation of dynamic, brake or safety systems designed for vehicular use, traffic signal instruments, all types of safety devices, and other applications intended to support or sustain life. All Insecure Usage shall be made at customer’s risk, and in t he event that third parties lay claims to Nuvoton as a result of customer’s Insecure Usage, customer shall indemnify the damages and liabilities thus incurred by Nuvoton.