NCN1154MUTGEVB

NCN1154MUTGEVB NCN1154 DP3T USB 2.0 High Speed Audio Switch Evaluation Board User's Manual http://onsemi.com Prepared by: Bertrand RENAUD On Semiconductor EVAL BOARD USER’S MANUAL OVERVIEW and provide a safe path to ground for any charge that may build up on the audio lines. This reduces Pop & Click noise in the audio system. The device has an extended VCC range which can operate off VCC up to 4.2 V while passing true ground audio signals down to −2 V. The NCN1154 is housed in a space saving, ultra low profile 1.7 x 2.0 x 0.5 mm 12 pin DFN package. The NCN1154 is a DP3T switch for combined true−ground audio, USB 2.0 high speed data, and UART applications. It allows portable systems to use a single port to pass either USB data or audio signals from an external headset. The switch is capable of passing signals with negative voltages as low as 2 V below ground. The NCN1154 features shunt resistors on the audio ports. These resistors are switched in when the audio channel is off Figure 1. Board Picture © Semiconductor Components Industries, LLC, 2010 July, 2010 − Rev. 0 1 Publication Order Number: EVBUM2003/D NCN1154MUTGEVB NCN1154 − BOARD SCHEMATIC 4 3 2 1 “B” Receptacle J4 VBUS D− D+ GND 1 D1 ESD 11n5 1 2 1 2 1 2 2 1 ESD 11n5 ESD 11n5 ESD 11n5 1 2 D− (5) D+ (1) Rx (4) Tx (2) R (6) L (12) Banana Jacks GND VCC 1uF Control Logic VCC (3) COM− (8) COM+ (10) IN1 (11) 0.1uF ESD 11n5 1 2 ESD 11n5 1 2 VCC Toggle Switch SW2 “A” Receptacle J6 VBUS D− D+ GND http://onsemi.com “B” Receptacle J5 VBUS 2 3 D− 4 ESD 11n5 1 2 VCC 2 D+ GND right in left in Banana Jacks ESD 11n5 IN2 (7) Toggle Switch SW1 Figure 2. Board Schematic NCN1154MUTGEVB NCN1154 − BOARD CONNECTIONS SUPPLY Symbol VCC, GND Description This is the positive and the return connection for power supply (Pins 3 and 9). SETUP Symbol Description SW1 This is the toggle switch for IN2 (Pin 7). SW2 This is the toggle switch for IN1 (Pin 11). SIGNALS Symbol COMMON USB UART Description This standard USB connector is the common data and audio lines (Pins 8 and 10). This USB connector Male A type is the high speed USB signaling path (Pins 1 and 5). This USB connector Male B type is dedicated for Tx and Rx data lines for UART signals (Pins 2 and 4). LEFT IN This connector is the left audio signal (Pin 12). RIGHT IN This connector is the right audio signal (Pin 6). http://onsemi.com 3 NCN1154MUTGEVB NCN1154 − TEST PROCEDURE Equipment needed − − − − − Power Supply Digital Ohm Meter Desktop or Laptop with Windows XP or higher USB Key USB Headset BACKGROUND: IN1 & IN2 TRUTH TABLE IN1 IN2 D+, D− Rx, Tx L, R L, R SHUNT 0 0 Hi Z Hi Z Hi Z ON 0 1 ON Hi Z Hi Z ON 1 0 Hi Z Hi Z ON OFF 1 1 Hi Z ON Hi Z ON Test 1. Connect the power supply at 3.6 V from VCC to GND. The supply current should be less than 35 mA. 2. Turn SW1 and SW2 to G (ground) position The impedance measured from COM+ to D+, Tx and L is over 10 MW. The impedance measured from COM− to D−, Rx and R is over 10 MW. The impedance measured from L & R to GND is closed to 118 W. 3. Turn SW1 to + (VCC) and keep SW2 to G (ground) The impedance measured from COM+ to D+ is closed to 5.5 W. The impedance measured from COM− to D− is closed to 5.5 W. The impedance measured from COM+ to Tx and L is over 10 MW. The impedance measured from COM− to Rx and R is over 10 MW. The impedance measured from L & R to GND is closed to 118 W. 4. Place a USB key connected to COMMON terminal (J6) and connect the USB terminal (J4) to the laptop or desktop. The device is being recognized. Remove both USB cable and USB key for next measurement. 5. Keep SW1 to + (Vcc) and turn SW2 to + (Vcc) The impedance measured from COM+ to Tx is closed to 5.5 W. The impedance measured from COM− to Rx is closed to 5.5 W. The impedance measured from COM+ to D+ and L is over 10 MW. The impedance measured from COM− to D− and R is over 10 MW. The impedance measured from L & R to GND is closed to 118 W. 6. Place a USB key connected to COMMON terminal (J6) and connect the UART terminal (J5) to the laptop or desktop. The device is being recognized. Remove both USB cable and USB key for next measurement 7. Turn SW1 to G (ground) and keep SW2 to + (Vcc) The impedance measured from COM+ to L is closed to 3 W. The impedance measured from COM− to R is closed to 3 W. The impedance measured from COM+ to D+ and Tx is over 5 MW. The impedance measured from COM− to D− and Rx is over 5 MW. The impedance measured from L & R to GND is over 5 MW. http://onsemi.com 4 NCN1154MUTGEVB NCN1154 − COMPONENTS SELECTION Input Capacitor A 0.1 mF X5R ceramic capacitor or larger must bypass Vcc input to the ground. This capacitor should be placed as close as possible to this input. ESD Diode These devices have limited built−in ESD protection, an external bi−directional ESD / IEC diode is recommended on COM+ and COM− pin. The demoboard includes six additional ESD diodes for test purpose which are not required by the application. The ESD11N is designed to protect voltage sensitive components that require ultra−low capacitance from ESD and transient voltage events. Excellent clamping capability, low capacitance, low leakage, and fast response time, make these parts ideal for ESD protection on designs where board space is at a premium. Because of its low capacitance, it is suited for use in high frequency designs such as USB 2.0 high speed and antenna line applications. NCN1154 – BILL OF MATERIAL Designator Qty Description Value Tolerance Footprint Manufacturer Manufacturer Part Number U1 1 IC, High Speed Switches NA NA UDFN−12 ON Semiconductor NCN1154 D1, D2, D4, D5, D6, D8, D10, D12 8 ESD Diode NA NA 0.6 x 0.3 mm ON Semiconductor ESD11N5.0ST5G C1, C3 1 Ceramic capacitor 10 nF $20% 0402 AVX Corporation 04023C103KAT2A C2 1 Ceramic capacitor 1 mF $20% 0603 Murata GRM188R61C105 J6 1 USB Connector Male ANG Receptable NA NA A Type Mill−Max 896−43−004−90−000000 J4, J5 2 USB Connector Male NA NA B Type Molex/Waldom 67265−2001 Single Banana NA NA NA Pomona Electronics 2142−6 2142−9 VERT Receptable BJ6 1 BJ12 1 Single Banana NA NA NA Pomona Electronics BJ 1 Double Banana NA NA NA Pomona Electronics 2143−0 SW1, SW2 2 Switch NA NA NA ITT CANNON OS103011MS8QP1 PCB 1 5.0 x 5.0 x 0.25 mm 2 Layers NA NA NA Any EBT1745−01 REV: A NCN1154 − PCB LAYOUT GUIDELINES Electrical Layout Considerations Implementing a high speed USD device requires paying attention on USB lines and traces to preserve signal integrity. The demonstration board serves as layout example and can support the design engineers to preserve high speed performances. Electrical layout guidelines are: − The bypass capacitor must be placed as close as possible to the Vcc input pin for noise immunity. − The characteristic impedance of each High Speed USB segment must be 45 W. − All corresponding D+ / D− line segment pairs must be the same length. − The use of vias to route these signals should be avoided. − The use of turns or bends to route these signal should be avoided. − The ground plane of the PCB will be used to determine the characteristics impedance of each line. http://onsemi.com 5 NCN1154MUTGEVB NCN1154 − DEMOBOARD PCB LAYOUT Board Reference: EBT1745−01 REV: A Figure 3. Top Layer Routing http://onsemi.com 6 NCN1154MUTGEVB Figure 4. 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