NCN51205GEVB

NCN51205GEVB KNX Evaluation Board User'sManual http://onsemi.com EVAL BOARD USER’S MANUAL Introduction Key Features • 9,600 baud KNX Communication Speed • Supervision of KNX Bus Voltage • High Efficient 3.3 V to 21 V Selectable DC−DC The NCN5120 Development Board is the ideal solution for developing your KNX application with the ON Semiconductor KNX transceiver NCN5120. The development board contains the NCN5120 KNX Transceiver which handles the transmission and reception of data on the bus. It will also generate all necessary voltages to power the board and external loads. It also contains a microcontroller with debug interface for custom firmware development. Up to 8 external switches can be monitored and up to 4 external loads can be controlled. A voltage between 3.3 V and 21 V is available to drive the external loads. The NCN5120 Development Board assures safe coupling to and decoupling from the KNX bus. Bus monitoring warns the external microcontroller for loss of power so that critical data can be stored in time. • • • • • • • • • • • • • • • • Converter to Drive External Loads Monitoring of Power Regulators No Additional Power Supply Required Buffering of Sent Data Frames (Extended Frames Supported) Selectable UART or SPI Interface to Host Controller Selectable UART and SPI Baud Rate to Host Controller Optional CRC on UART to the Host Optional MARKER Character to the Host Optional Direct Coupling of RxD and TxD to Host (Analog Mode) Auto Polling (Optional) Temperature Monitoring Contains Freely Programmable Microcontroller for Custom Applications Monitoring of 8 External Switches Controlling of 4 External (High Voltage) Loads (e.g. LED’s) One Freely Usable Push Button 3 Freely Usable LED’s Operating Temperature Range −25°C to +85°C Figure 1. NCN5120 Development Board © Semiconductor Components Industries, LLC, 2013 May, 2013 − Rev. 0 1 Publication Order Number: EVBUM2186/D NCN51205GEVB BLOCK DIAGRAM Clock RESETb, SAVEb NCN5120 MSP430 Interface UART or SPI Adj. Reg. 3 LED + Switch LED1,2,3, SW1 Figure 2. NCN5120 Development Board Block Diagram CONNECTOR DESCRIPTION Table 1. CONNECTOR LIST AND DESCRIPTION Connector Description J1 KNX Bus Connection J2 Power Supply and UART Connection J3 External Switch Inputs and External Outputs J4 Microcontroller Debug Interface TYPICAL APPLICATION KNX Bus 4 Push Buttons (with each one blue LED) Figure 3. Typical Application http://onsemi.com 2 Connector J3 Low Side Drive 3.3 V ESD Protection J1 Reverse Protection Diode + TVS Connector J4 NCN51205GEVB ELECTRICAL SPECIFICATION Recommend Operation Conditions Operating ranges define the limits for functional operation and parametric characteristics of the development board. Note that the functionality of the development board outside these operating ranges is not guaranteed. Operating outside the recommended operating ranges for extended periods of time may affect device reliability. Table 2. OPERATING RANGES Symbol Parameter Min Max Unit +20 +33 V Input Voltage on J4 and J3 (Pins 9, 11, 13 and 15) and J2 (Pin 8) 0 3.3 V VDIG2 Input Voltage on J3 (Pins 1, 3, 5 and 7) (Note 2) 0 5 V VDD1 Output Voltage on J2 (Pin 1) 0 3.3 V VDD2 Output Voltage on J3 (Pins 2, 4, 6 and 8) and J2 (Pins 3 and 7) (Note 3) 3.3 21 V V20V Output Voltage on J2 (Pin 5) VBUS Voltage on Positive Pin of J1 (Note 1) VDIG1 Ta Ambient Temperature 0 22 V −25 +85 °C 1. Voltage indicates DC value. With equalization pulse bus voltage must be between 11 V and 45 V 2. Higher voltages are possible. See Adjustable DC−DC Converter page 15 for more details. Only valid if R12, R17, R22 and R25 are not mounted. 3. See Adjustable DC−DC Converter page 15 for the limitations! Table 3. DC PARAMETERS (The DC parameters are given for a development board operating within the Recommended Operating Conditions unless otherwise specified.) Convention: currents flowing in the circuit are defined as positive. Symbol Connector Pin(s) Remark/Test Conditions Parameter Min Typ Max Unit 33 V Power Supply VBUS J1 1 IBUS Bus DC Voltage Excluding Active and Equalization Pulse Bus Current Consumption Normal Operating Mode, No External Load, DC1 and DC2 Enabled, Continuous Transmission of ‘0’ on the KNX Bus by another KNX Device 20 5 mA VBUSH Undervoltage Release Level VBUS Rising (Figure NO TAG) 18.0 V VBUSL Undervoltage Trigger Level 16.8 V VBUS_Hyst VBUS Falling (Figure NO TAG) Undervoltage Hysteresis 0.6 V KNX Bus Coupler Icoupler_lim J1 1 Bus Coupler Current Limitation J5 open 13 30 mA J5 shorted 26 60 mA 3.47 V Fixed DC−DC Converter VDD1 J2 1 Output Voltage 3.13 VDD1_rip Output Voltage Ripple IDD1_lim Overcurrent Threshold ηVDD1 Power Efficiency VBUS = 26 V, IDD1 = 40 mA 3.3 40 −100 Vin = 26 V, IDD1 = 35 mA http://onsemi.com 3 mV −200 90 mA % NCN51205GEVB Table 3. DC PARAMETERS (continued) (The DC parameters are given for a development board operating within the Recommended Operating Conditions unless otherwise specified.) Convention: currents flowing in the circuit are defined as positive. Symbol Connector Pin(s) Remark/Test Conditions Parameter Min Typ Max Unit 21 V Adjustable DC−DC Converter VDD2 J2, J3 VDD2H 3 (J2), 2, 4, 6 and 8 (J3) Output Voltage VBUS > VDD2 3.3 Undervoltage Release Level VDD2 Rising (Figure NO TAG) 0.9 × VDD2 V Undervoltage Trigger Level VDD2 Faling (Figure NO TAG) 0.8 × VDD2 V VDD2_rip Output Voltage Ripple VBUS = 26 V, VDD2 = 3.3 V, IDD2 = 40 mA 40 mV IDD2_lim Overcurrent Threshold VDD2L ηVDD2 −100 Power Efficiency Vin = 26 V, VDD2 = 3.3 V, IDD2 = 35 mA 20 V Output Voltage I20V < 4 mA, VBUS > 25 V −200 90 mA % 20 V Regulator V20V J2 5 I20V_Lim 20 V Output Current Limitation 18 20 −4 22 V −11 mA V20VH 20 V Undervoltage Release Level 20 V Rising 12.6 13.4 14.2 V V20VL 20 V Undervoltage Trigger Level 20 V Falling 11.8 12.6 13.4 V Overcurrent Threshold V20V_hyst = V20VH − V20VL Logic Low Threshold Pin 1, 3, 5 and 7 (J3) only valid if R12, R17, R22 and/or R25 are mounted and Q1, Q2, Q3 and/or Q4 are not mounted. V20V_hys 0.8 V Digital Inputs VIL VIH J2 7 J3 1, 3, 5, 7, 9, 11, 13, 15 J4 2, 3, 4, 5, 6, 8 J2 7 J3 1, 3, 5, 7, 9, 11, 13, 15 J4 2, 3, 4, 5, 6, 8 Logic High Threshold 0 0.7 V 2.65 3.3 V Digital Outputs VOL J2 7 VOH VOL_OD J3 1, 3, 5, 7 Logic Low Output Level 0 − 0.6 V Logic High Output Level VDD1 − 0.6 − VDD1 V − − 0.4 V Logic Low Level Open Drain IOL = 5 mA http://onsemi.com 4 NCN51205GEVB Table 4. AC PARAMETERS (The AC parameters are given for a development board operating within the Recommended Operating Conditions unless otherwise specified.) Symbol Pin(s) Parameter Remark/Test Conditions Min Typ Max Unit (Figure x3) − 2 − ms SPI Baudrate Depending on Configuration Input Bits (see Interface Mode page 16). Tolerance is Equal to Xtal Oscillator Tolerance. (Figure 7) − 2 − ms − 8 − ms − tsck / 2 − Power Supply tBUS_FILTER VBUS1 VBUS1 Filter Time MASTER Serial Peripheral Interface (MASTER SPI) tsck SCK tSCK_HIGH SPI Clock High Time tSCK_LOW tSDI_SET SPI Clock Low Time SDI tSDI_HOLD tSDO_VALID − tsck / 2 − 125 − − ns 125 − − ns − − 100 ns 0.5 × tSCK − − SPI Chip Select Setup Time 0.5 × tSCK − − SPI Chip Select Hold Time 0.5 × tSCK − − SPI Data Input Setup Time SPI Data Input Hold Time SDO tCS_HIGH tCS_SET SPI Clock Period CSB tCS_HOLD SPI Data Output Valid Time CL = 20 pF (Figure 7) SPI Chip Select High Time (Figure 7) (Figure 7) tTREQ_LOW TREQ Low Time 125 − − ns tTREQ_HIGH TREQ High Time 125 − − ns TREQ Setup Time 125 − − ns TREQ Hold Time 125 − − ns − 19,200 − Baud − 38,400 − Baud tTREQ_SET TREQ tTREQ_HOLD Universal Asynchronous Receiver/Transmitter (UART) fUART TXD, RXD UART Interface Baudrate Baudrate Depending on Configuration Input Pins (see Interface Mode page 16). Tolerance is equal to tolerance of Xtal oscillator tolerance. VBUS VBUSH VBUSL t BUS_FILTER Comments: is an internal signal which can be verified with the Internal State Service . Figure 4. Bus Voltage Undervoltage Threshold http://onsemi.com 5 t BUS_FILTER t NCN51205GEVB VDD2 VDD2H VDD2L t Comments: is an internal signal which can be verified with the System State Service. Figure 5. VDD2 Undervoltage Threshold V20V V20V_hyst V20VH V20VL t Comments: is an internal signal which can be verified with the System State Service. Figure 6. V20V Undervoltage Threshold levels CS CLK ÎÎÎÎÎÎ ÎÎÎÎÎÎ ÎÎÎÎÎÎ ÎÎÎÎÎÎ DI DO tSDI_SET tCS _SET ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tSDI _HOLD tCS _HIGH t SDO_VALID tSCK _HIGH tSCK _LOW tSCK tCS_HOLD Figure 7. SPI Bus Timing Diagram http://onsemi.com 6 NCN51205GEVB THyst T THyst TTSD DT TTW t SAVEB Normal Stand−By Start−Up Reset Stand−By Normal RESETB Analog State Comments : − is an internal signal which can be verified with the System State Service. −No SPI / UART communication possible when RESETB is low! −It’s assumed all voltage supplies are within their operating condition. Figure 8. Temperature Monitoring Levels CS CLK ÎÎÎÎÎ ÎÎÎÎÎ ÎÎÎÎÎ ÎÎÎÎÎ DI DO LSB 1 Dummy 2 Dummy 7 Dummy ÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎ Dummy TREQ tTREQ _SET tTREQ_HOLD tTREQ _LOW tTREQ_HIGH Figure 9. TREQ Timing Diagram http://onsemi.com 7 NCN51205GEVB APPLICATION SCHEMATIC Figure 10. Schematic of NCN5120 Development Board (Part 1) http://onsemi.com 8 NCN51205GEVB APPLICATION SCHEMATIC Figure 11. Schematic of NCN5120 Development Board (Part 2) http://onsemi.com 9 NCN51205GEVB Figure 12. Top Layer of NCN5120 Development Board Figure 13. Bottom Layer of NCN5120 Development Board http://onsemi.com 10 NCN51205GEVB Figure 14. Inner Layer 1 of NCN5120 Development Board Figure 15. Inner Layer 2 of NCN5120 Development Board http://onsemi.com 11 NCN51205GEVB Figure 16. Top Silkscreen of NCN5120 Development Board Figure 17. Bottom Silkscreen of NCN5120 Development Board http://onsemi.com 12 NCN51205GEVB Table 5. BILL OF MATERIALS (Note 1) Reference Part Number Value Voltage Power Tol Type Manufacturer Footprint CON1 243-211 Wago NA C1, C2 C1005COG1H100D 10 pF 6.3 V ±5% Ceramic Multilayer TDK 0402 C3, C4, C7 C1005X5R0J104M 100 nF 6.3 V ±20% Ceramic Multilayer TDK 0402 C5 C1608X5R1H473M 47 nF 50 V ±20% Ceramic Multilayer TDK 0603 C6 C1005X5R1H472K 4.7 nF 50 V ±10% Ceramic Multilayer TDK 0402 C8 B41145A7107M000 100 mF 35 V ±20% Aluminum Electrolytic Epcos 8 × 10 C9 C1608X5R1H105K 1 mF 35 V ±10% Ceramic Multilayer TDK 0603 C10 (Note 2) C1005COG1H100D 10 pF 6.3 V ±5% Ceramic Multilayer TDK 0402 C11 C2012X5R1E106M 10 mF 25 V ±20% Ceramic Multilayer TDK 0805 C12 C1608X5R0J106M 10 mF 6.3 V ±20% Ceramic Multilayer TDK 0603 C13 C1608X5R1H105M 1 mF 50 V ±20% Ceramic Multilayer TDK 0603 C14 (Note 2) C1005X5R1H222K 2.2 nF 6.3 V ±10% Ceramic Multilayer TDK 0402 C15, C16 C1005X5R0J105M 1 mF 6.3 V ±20% Ceramic Multilayer TDK 0402 C17 C1005C0G1H120J 12 pF 6.3 V ±5% Ceramic Multilayer TDK 0402 D1 SS16T3G ON Semiconductor SMA D2 1SMA40AT3G ON Semiconductor SMA D3, D13 (Note 2) NSR0520V2T1G ON Semiconductor SOD-523 D4, D9, D10, D11, D12 SMF5.0AT1G ON Semiconductor SOD-123FL D5, D6, D7, D8 ESD5Z3.3T1G ON Semiconductor SOD-523 J1 RT−01T−1.0B(LF) JST 5.75 mm pitch J2 (Note 2) 620 008 211 21 Wurth Elektronik 2 mm pitch J3 620 016 211 21 Wurth Elektronik 2 mm pitch J4 620 008 211 21 Wurth Elektronik 2 mm pitch J5, J6, J7, J8 620 002 111 21 Wurth Elektronik 2 mm pitch L1, L2 DA54NP−221K Coils Electronic See Datasheet LED1, LED2, LED3 HSMG−C190 Avago Technologies 1.6 × 0.8 Q1, Q2, Q3, Q4 2N7002L ON Semiconductor SOT-23 ±10% 220 mH R1 D3082F05 Harwin See datasheet R4 RC1218JK−xx22RL 22 W 1W ±10% Thick Film Yageo 1218 R5 RC0402JR−xx0RL 0W 0.0625 W NA Thick Film Yageo 0402 R6 RC0402JR−xx33KL 33 kW 0.0625 W ±5% Thick Film Yageo 0402 R7, R8 RC0402JR−xx1RL 1W 0.0625 W ±5% Thick Film Yageo 0402 R9 RC0402JR−xx180KL 180 kW 0.0625 W ±5% Thick Film Yageo 0402 R11 (Note 2) RC0402JR−xx47KL 47 kW 0.0625 W ±5% Thick Film Yageo 0402 R12, R17, R22, R25 (Note 2) RC0402JR−xx0RL 0R 0.0625 W NA Thick Film Yageo 0402 R13 (Note 2) RC0402JR−xx0RL 0R 0.0625 W NA Thick Film Yageo 0402 R15, R18, R23, R26 RC0402JR−xx1KL 1 kW 0.0625 W ±5% Thick Film Yageo 0402 R16, R19, R24, R27 RC0402JR−xx1ML 1 MW 0.0625 W ±5% Thick Film Yageo 0402 1. All devices are Pb-Free. 2. Not mounted. http://onsemi.com 13 NCN51205GEVB Table 5. BILL OF MATERIALS (continued)(Note 1) Reference Part Number Value R20, R28, R29 RC0402JR−xx1KL Voltage Power Tol Type Manufacturer Footprint 1 kW 0.0625 W ±5% Thick Film Yageo 0402 100 kW 0.0625 W ±5% Thick Film R21 RC0402JR−xx100KL Yageo 0402 SW1 MCIPTG33K−V Multicomp See Datasheet TP1 … TP19 20−2137 Vero 1.02 mm U1 NCN5120 ON Semiconductor QFN-40 U2 MSP430F2370IRHAx Texas Instruments VQFN-40 Y1 FA-238, 16 MHz, 50 ppm, 10 pF Epson Toyocom 3.2 × 2.5 1. All devices are Pb-Free. 2. Not mounted. http://onsemi.com 14 NCN51205GEVB FUNCTIONAL DESCRIPTION Because the NCN5120 Development Board contains the NCN5120 KNX Transceiver (KNX Certified) no details on KNX will be given in this document. Detailed information on the Certified KNX Transceiver NCN5120 can be found in the NCN5120 datasheet (www.onsemi.com). Detailed information on the KNX Bus can be found on the KNX website and in the KNX standards (www.knx.org). Above formula gives only an estimation and will mainly depend on the firmware loaded on the microcontroller (U2, see Figure 11). One must always verify that the KNX bus loading is in line with the KNX Specification under all operating conditions! Xtal Oscillator A crystal of 16 MHz (Y1, see Figure 11) is foreseen on the development board. This clock signal is also supplied to the microcontroller. See the NCN5120 datasheet (www.onsemi.com) for more details on this signal. KNX Bus Connection Connection to the KNX bus is done by means of J1. A standard Wago connector (type 243−211) can be used for this (see Figure 18). A reverse protection diode (D1, Figure 11) is foreseen (mandatory) as also a Transient Voltage Suppressor (D2, Figure 11). RESETB and SAVEB The KNX transceiver NCN5120 controls the reset state of the microcontroller by means of the RESETB signal. An additional signal SAVEB can be monitored by the microcontroller to detect possible issues. See NCN5120 datasheet for more details on these two signals. Voltage Supervisors NCN5120 has different voltage supervisors. Please check the NCN5120 datasheet for more details. Temperature Monitor NCN5120 produces an over-temperature warning (TW) and a thermal shutdown warning (TSD). Please check the NCN5120 datasheet for more details. Figure 18. KNX Bus Connector External IO Adjustable DC−DC Converter The development board has the possibility to monitor up to 8 inputs (pin 1, 3, 5, 7, 9, 11, 13 and 15 of J3) and control up to 4 outputs (pin 1, 3, 5 and 7 of J3). Notice that 4 of the inputs are shared with 4 of the outputs (pin 1, 3, 5 and 7 of J3). By default the board has 4 inputs (pin 9, 11, 13 and 15 of J3) and 4 outputs (pin 1, 3, 5 and 7 of J3). To use the additional 4 inputs, Q1 … Q4 need to be removed and R12, R17, R22 and R25 need to be mounted. The input pins are 3.3 V compliant and ESD protected (D5 … D8, Figure 11). J3 is connected in such a way that an easy connection between the input and ground is possible (pin 9, 11, 13 and 15 of J3). The microcontroller (U2, see Figure 11) should be configured with an internal pull-up (see microcontroller datasheet on how to do this). The external outputs are driven by means of low-side drivers (Q1 … Q4, see Figure 11). A gate resistor is foreseen for slope control (R15, R18, R23 and R26 of Figure 11). J3 is routed in such a way that the load can easily be connected between the output (low-side driver) and VDD2. Q1 … Q4 can be used over the complete VDD2 voltage range. ESD diodes D9 … D12 need to be replaced if VDD2 is increased (see also Adjustable DC-DC Converter). NCN5120 provides the power for the complete reference design. It has also a second power supply which can be used to drive external loads. The voltage is programmable between 3.3V and 21V by means of an external resistor divider (R6 and R9, see Figure 11). The voltage divider can be calculated as next: R6 + R 9 R VDD2M R 9 ) R VDD2M V DD2 * 3.3 3.3 (eq. 1) RVDD2M is between 60 kW and 140 kW (typical 100 kW). The DC value of the KNX bus should be higher than VDD2. Be aware that when changing the VDD2 voltage, D9 … D12 (see Figure 11) need to be replaced. Check the SMFxxA product family for possible replacements (www.onsemi.com). Although VDD2 is capable of delivering 100 mA, the maximum current capability will not always be usable. One needs to make sure that the KNX bus power consumption stays within the KNX specification. The maximum allowed current for VDD2 can be calculated as next: V BUS I BUS w 2 ƪ0.033 ) ǒV DD2 I DD2Ǔƫ (eq. 2) IBUS is limited by NCN5120. If J5 is open, IBUS can maximum be 12.5 mA. If J5 is shorted, IBUS can maximum be 25 mA. IBUS will however also be limited by the KNX standard. Minimum VBUS is 20 V (see KNX standard). Push Button and LED’s One push button (SW1) and 3 LED’s (LED1 … LED3) are foreseen on the reference design. These are freely usable. http://onsemi.com 15 NCN51205GEVB Jumpers microcontroller (U2, Figure 11) but this is only used to verify the development board before shipment. The user has the possibility to develop his own firmware but help on programming the microcontroller will not be provided my ON Semiconductor. NCN5120 contains the physical layer and a part of the data link layer (see Figure 19). ON Semiconductor can provide a library for the microcontroller to complete the data link layer. By no means will ON Semiconductor provide any of the higher layer stacks (Network Layer, Transport Layer, …). Sufficient 3rd party companies are available which have certified higher layer stacks. Several jumpers are located on the board (J5 ... J8). J5 can be used to set the Fan-In. Mount the jumper for the highest Fan-In setting. J6 is required when one wants to force NCN5120 in Analog Mode (make sure microcontroller is in reset to avoid conflicts!). J7 can be used to disconnect the microcontroller from the fixed DC/DC converter of NCN5120. Be aware that if the microcontroller is not powered, NCN5120 could start powering the microcontroller over the IO-pins. It’s advised to always short J7. J8 can be used to disconnect the RESETB-signal from the RST-pin of the microcontroller. FAQs 1. Is this development board KNX Certified? No, only NCN5120 is KNX Certified. The development board may only be used for evaluation of NCN5120. It is not allowed to use the development board in a final product or to sell it as a KNX Certified product. Contact ON Semiconductor if you want to use the development board as a final product. Microcontroller Debug Interface J4 is the microcontroller debug interface. See the microcontroller datasheet for more info on how to use this interface. Interface Mode The device can communicate with the host controller by means of a UART interface or an SPI interface. The selection of the interface is done by the pins MODE1, MODE2, TREQ, SCK/UC2 and CSB/UC1 which are connected to the microcontroller (see Figure 11). More details on the different interfaces can be found back in Table 6 and the NCN5120 datasheet. 2. What 3rd party companies do you recommend for the higher layer stacks? ON Semiconductor does not recommend any 3rd party company in particular. Several 3rd party companies have KNX Certified stacks and it’s always advised to use one of these stacks. Some companies have experience with NCN5120. Contact ON Semiconductor for more information. Digital Description The implementation of the Data Link Layer as specified in the KNX standard is divided in two parts. All functions related to communication with the Physical Layer and most of the Data Link Layer services are inside NCN5120, the rest of the functions and the upper communication layers are implemented into the microcontroller (see Figure 11 and Figure 19). The host controller is responsible for handling: • Checksum • Parity • Addressing • Length 3. Can we freely reuse the schematic and layout of this development board? It is allowed to reuse the schematic, components and layout of the NCN5120 development board for your own application. Because the operating conditions of your design are not known by ON Semiconductor, one must always fully verify the design even if it’s based on this development board. Contact ON Semiconductor if additional information is required. 4. Can we request ON Semiconductor to supply the higher layer stacks? By no means will ON Semiconductor provide any higher layer stacks. Certified higher layer stacks can be provided by 3rd party companies (see also Firmware). The NCN5120 is responsible for handling: • Checksum • Parity • Acknowledge • Repetition • Timing 5. How much load can the outputs drive? The maximum allow load can be calculated with the formula as given in Adjustable DC-DC Converter (page x13). IDD2 defines the maximum load the outputs can drive in total. Services All services can be found back in the NCN5120 datasheet (www.onsemi.com). Firmware No special firmware is provided with the development board. There will be some basic firmware flashed on the http://onsemi.com 16 NCN51205GEVB 9. Is it possible to bypass the microcontroller on the KNX REV5 board and connect NCN5120 directly with our microcontroller board? Although the board is not designed for this, this is possible. One could connect NCN5120 directly to your microcontroller board by soldering some wires on the KNX REV5 board. It is however advised to remove the microcontroller from the KNX REV5 board or to put the microcontroller in reset (short pins 8 and 7 of J4 (see Figure 10)). In case one wants to use the UART interface (9-bit UART, 19 200 bps) or Analog Mode, one could even use connector J2. The KNX_TXD and KNX_RXD give a direct connection to the TXDand RXD-pin of NCN5120. Because the MODE1-, MODE2- and TREQ-pin have an internal pull down, one does not even need to connect these pins for UART mode. For Analog Mode one can use J6 to make the TREQ-pin high. 6. What is the usage of ARXD and ATXD (Figure 11)? These pins have no meaning and cannot be used. 7. I’ve tried all possible R6 and R9 combinations but I’m not capable of setting VDD2 above 6 V. How does this come? As can be seen in Figure 10, VDD2 (5 V) is connected to an ESD protection diode (D14). This is a 5 V ESD protection diode. Whenever one tries to set VDD2 above 5 V, this ESD diode will trigger and limit the VDD2 voltage to about 6 V. This issue can be solved by, or removing D14 (in an ESD safe area this should not be an issue), or by replacing this 5 V ESD diode with a higher voltage version (see the SMFxxA datasheet for other versions (www.onsemi.com)). 8. Is it possible to test all interfaces (UART, SPI, Analog Mode) with KNX REV5? Yes, the KNX REV5 board can be used with all possible interfaces. One has to be careful however when using the Analog Mode. In the Analog Mode the digital of NCN5120 is bypassed. If the microcontroller would force the RXD−pin (pin 29) of NCN5120 low, NCN5120 would pull the KNX bus low which could lead to issues. 10. I’m trying to sink more than 13 mA from the KNX bus with KNX REV5 but I’m having issues with the voltage regulators whenever I’m going above 16 mA. What could be the issue? To be able to take more than 13 mA from the KNX bus one needs to pull the FANIN/WAKE−pin of NCN5120 low. This can be done by shorting J5 (add jumper). See NCN5120 datasheet for more info on the FANIN/WAKE−pin. Table 6. INTERFACE SELECTION TREQ MODE2 MODE1 SCK/UC2 SCB/UC1 SDI/RXD SDO/TXD Description 0 0 0 0 0 RXD TXD 9-bit UART-Mode, 19,200 bps 0 0 0 0 1 9-bit UART-Mode, 38,400 bps 0 0 0 1 0 8-bit UART-Mode, 19,200 bps 0 0 0 1 1 1 0 0 X X Driver Receiver Analog Mode TREQ 0 1 SCK (out) CSB (out) SDI SDO SPI Master, 125 kbps TREQ 1 0 8-bit UART-Mode, 38,400 bps SPI Master, 500 kbps NOTE: X = Don’t Care http://onsemi.com 17 7 Application Layer 6 Presentation Layer 5 Session Layer 4 Transport Layer 3 Network Layer Host Controller NCN51205GEVB Logic Link Control Data Link Layer Media Access Control 1 Physical Layer NCN5120 2 Figure 19. OSI Model Reference http://onsemi.com 18 NCN51205GEVB BOARD DIMENSIONS 64.5 61.7 56.0 2.7 19.7 61.7 −Above dimensions are in mm −Height C8 = 11 mm −Height J1 = 7 mm (pins only) −Height J2, J3, J4 = 6 mm −Height L1 and L2 (bottom side of PCB) = 4.8 mm The product described herein may be covered by one or more US patents pending. http://onsemi.com 19 2.8 2.8 3.1 32.4 36.2 39.0 35.2 31.0 12.5 2.3 onsemi, , and other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/or subsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. onsemi is an Equal Opportunity/Affirmative Action Employer. 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