DEMO MANUAL DC2156A LTC2946 Wide Range I2C Power, Charge and Energy Meter Description Demonstration circuit 2156A features the LTC®2946 rail-to-rail system monitor that measures current, voltage, power, energy and charge. It features an operating range of 2.7V to 100V and includes a shunt regulator for operation from supplies above 100V to allow flexibility in the selection of input supply. The current measurement range of 0V to 100V is independent of the input supply. An onboard, 0.4% accurate, 12-bit ADC measures load current, input voltage and an auxiliary external voltage. A 24-bit power value is generated by digitally multiplying the measured 12-bit load current and input voltage data. Energy and charge data are generated by integrating power and current. Minimum and maximum values are stored and an overrange alert with programmable thresholds minimizes the need for software polling. Data is reported via a standard I2C interface. Shutdown mode reduces power consumption to 20μA. + – The demo board features nested pads for a range of sense resistor package sizes to support currents of up to 15A range. The full scale sense voltage is 102.4mV. A 20mΩ sense resistor is populated on the board for 5.12A full scale. The full scale current can be changed by populating RSNS accordingly. The DC2156A was designed to be connected to the DC590 and controlled through the QuikEval™ suite of software. All thresholds can be set and ADC registers read back through the QuikEval interface, which provides a convenient way to evaluate the LTC2946. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and QuikEval and Linduino are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 4V TO 75V LOAD TO DC590 OR DC2026 Figure 1. Typical Application Circuit dc2156af 1 DEMO MANUAL DC2156A DC2156A Pin and Jumper Definitions Jumper Settings JP1:Selects the VDD source. It can be set to VIN, INTVCC or EXTVDD (which requires a voltage to be present at the EXTVDD turret.) Please see Powering the DC2156A section for examples of how these different settings are used. JP2 (ADR0), JP3(ADR1): Selects the I2C slave address of the LTC2946. Any changes here should also be made inside of QuikEval for communications to persist. By default, both jumpers are set to LOW which corresponds to an address of 0xDE. Turrets and Banana Jacks Signal connections are made via the row of turret posts along the edges of the board. GND: (5 turrets, 2 banana jacks) These turrets are connected directly to the ground planes. VIN:Main Supply Input. The LTC2946 measures the current flowing from VIN to VOUT. VOUT:Supply Output to Load. The LTC2946 measures the current flowing from VIN to VOUT. INTVCC: Internal Low Voltage Supply Input/Output. This turret is directly connected to the INTVCC pin. This turret is used to power internal circuitry and can be configured as a direct input, as a linear regulator from a higher voltage connected to VDD or as a shunt regulator. In the default configuration with JP1 at VIN, INTVCC is internally generated and is 5V. Please see LTC2946 data sheet for more details. EXTVDD:External Voltage Supply. This turret can be used to power the LTC2946 independently of the VIN power path. Connect to 4V to 100V external supply if this option is selected through JP1. ADIN: Input Measured by the Onboard ADC. Measures between 0V to 2.048V. ADIN is loaded with a 140k and 3k resistive divider to allow voltage measurements of up to 102.4V full scale. 2 VPU: Pull Up Voltage for the LEDs. Derived from a 5V isolated supply on the DC590. It powers the GPIO LEDs on the board. If a DC590 is not used and the DC2156A is operated independently, a 2.5V to 5V supply must be provided here, in order for the LEDs to work. 5V from DC590 and the VPU turret input voltage are diode-ORed by D6 to preclude back feeding from one source to the other. SENSE+:Supply Voltage and Current Sense Input. Used as a Kelvin input for the internal current sense amplifier. The voltage at this pin is also monitored by the onboard ADC with a full-scale input range of 102.4V. The full scale current sense voltage is 102.4mV. SENSE–: Current Sense Input. An external 20mΩ sense resistor (RSNS) is connected between SENSE+ and SENSE– to measure a full scale current of 5.12A. See Hardware Setup section for details. SCL:I2C Clock input. SDA/SDAI: I2C Data Input. Connected to SDAO through 0Ω resistor R14. Remove R14 if opto-isolated I2C functionality is desired. SDAO:I2C Data Output. Connected to SDAI through 0Ω resistor R14. Remove R14 if opto-isolated I2C functionality is desired. GPIO1: General Purpose Input/Output 1. Configurable general purpose output and logic input. Configured by default as General Purpose Output, pulls low to light D3. GPIO2: General Purpose Input/Output 2. Configurable general purpose output, logic input, and ACC control input to gate internal accumulators. By default it is configured as ACC input and pulled high so that the energy and charge accumulation are active. If GPIO2 is configured as an output, LED D4 lights up when GPIO2 is asserted low. GPIO3: General Purpose Input/Output 3. Configurable general purpose output, logic input, and ALERT# output. By default it is configured as ALERT#. As ALERT#, it is pulled to ground when a fault occurs to alert the host controller. LED D5 lights when ALERT# is asserted low. dc2156af DEMO MANUAL DC2156A DC2156A Pin and Jumper Definitions Connectors DC590 Connector (J5): J5 allows connection of the DC2156A to the DC590 demo board through which the Linear Technology™ QuikEval software can communicate with the board. When DC590 is connected, 5V is provided to power the GPIO LEDs through this connector. LED ALERT# (GPIO3) – D5:Fault Alert Output. Lights up red on an ALERT condition. Can also be monitored on the ALERT (GPIO3) turret. ACC (GPIO2) – D4:Will light up amber when ACC is Low. By Default GPIO2 is an input, pulled high to VPU by D4 and R7. GPIO1 – D3: General Purpose Output. Lights up green when pulled low. Default state is low. INTVCC – D2:Lights up green when both VPU and LTC2946 are powered. Hardware Setup Options Flexible Operating Modes of the LTC2946 The LTC2946 current sense inputs, SENSE+ and SENSE– are used to make Kelvin connections to a current sense resistor to measure the output current of a supply or the current consumption of a load. They feature a common mode range of 0V to 100V so that the output current of either a positive or negative supply can be measured, as well as current in either the positive or negative lead of the load. Thus a potentially bewildering number of measurement configurations are possible. To allow such flexibility, the SENSE+ and SENSE– pins cannot be relied upon as a source of power; the LTC2946 features a separate VDD pin for this purpose. SENSE + SENSE – VDD INTVCC 5V LDO LTC2946 735k 15k GND Figure 2. Simplified Supply Block Diagram Power to operate LTC2946 is obtained from the VDD pin or the INTVCC pin (see the block diagram in Figure 2). If a supply of 4V to 100V is available, VDD can be used and an internal series regulator powers the device. If a supply of 2.7V to 5.9V is available, power may be applied directly to INTVCC. In the event that no supply of less than 100V is available, the shunt regulator shown connected across INTVCC can be used in conjunction with an external dropping resistor to power the LTC2946. Ringing It comes as a surprise to many that seemingly innocent acts, such as making a connection to a live supply, cause ringing. Theory tells us that the amplitude of such ringing reaches approximately 2x the input voltage, but in practice this limit is sometimes exceeded. For general information on ringing, see the LTC1647 data sheet. Since the VDD pin current is small, ringing there is easily suppressed by a 51Ω/100nF RC filter (R1 and C1) without any compromise to the input voltage range. The SENSE+ and SENSE– pins however are not so easily protected. To protect these pins and to prevent damage to the LTC2946 that might arise from ringing, VIN is clamped by an SMAT70A TVS (D1). D1 has a minimum breakdown voltage of 77V at room temperature and thus VIN DC input rating to 75V maximum. While D1 may be removed to operate VIN up to 100V, always remember that any excursion above this value may destroy the LTC2946. dc2156af 3 DEMO MANUAL DC2156A Hardware Setup Options Powering The DC2156A the same rail which is supplying power to the LTC2946. Provide 4V to 75V at VIN in this configuration to power the LTC2946. The 75V limitation is set by the zener clamp D1 which protects the LTC2946 against voltage transients exceeding 100V, while the 4V limitation is the minimum operating voltage of the VDD pin. D1 can be removed if the full voltage range of 100V is desired. The LTC2946 offers great flexibility in terms of supply options owing to its separate VDD and SENSE pins. Jumper JP1 is used to select the source of power for VDD and allows easy configuration of the various supply options. If JP1 is set to VIN, then VDD is powered from VIN (Figure 3a and Figure 3b). In this configuration, sensing is done on + – 4V TO 75V LOAD TO DC590 OR DC2026 Figure 3a. DC2156A Is Powered from VIN RSNS + – 4V TO 75V SENSE + SENSE – LOAD VDD LTC2946 GND Figure 3b. LTC2946 Powered from VIN 4 dc2156af DEMO MANUAL DC2156A Hardware Setup Options If JP1 is set to EXTVDD then VDD is powered by the EXTVDD turret (Figure 4a and Figure 4b). Provide a separate 4V to 100V at the EXTV DD turret in this configuration. The maximum input V IN is limited to 75V by D1. D1 can be removed if the full voltage range of 100V is desired. 0V TO 75V LOAD TO DC590 OR DC2026 + – 4V TO 100V Figure 4a. DC2156A Powered from External VDD RSNS 0V TO 75V SENSE + + – SENSE – LOAD VDD LTC2946 4V LTC2946 TO 100V GND GND Figure 4b. LTC2946 Powered from External VDD dc2156af 5 DEMO MANUAL DC2156A Hardware Setup Options If JP1 is set to INTVCC, then the LTC2946’s internal circuitry is powered from INTVCC. A low voltage supply (2.7V to 5.9V) connected to INTVCC helps minimize on-chip power dissipation (Figure 5a and Figure 5b). The device can also be used as a shunt regulator in this configuration to monitor rails higher than 100V. In order to support a wide range of applications, the LTC2946 demo board also features multiple nested sense pads to support high current monitoring. These pads are Kelvin sensed. By default the board supports current monitoring of up to 5.12A. An appropriate sense resistor can be used to support monitoring of desired current levels up to 20A with an on-board sense resistor. The SENSE+ and SENSE– turrets may be used to connect to an external sense resistor and power path for any current level. Remove RSNS in this case. Regardless of which configuration is selected, if the system is connected properly, the green INTVCC LED should be lit. By default the DC2156A is configured, with VIN providing power to VDD. 0V TO 75V LOAD + – TO DC590 OR DC2026 2.7V TO 5.9V Figure 5a. DC2156A Powered from INTVCC RSNS 0V TO 75V SENSE + + – 2.7V TO 5.9V SENSE – LOAD INTVCC VDD LTC2946 GND Figure 5b. LTC2946 Powered from INTVCC 6 dc2156af DEMO MANUAL DC2156A Hardware Setup Options DC2156A Shunt Regulator where VS(MAX) and VS(MIN) are the operating maximum and minimum of the supply. ILOAD(MAX) is the maximum external current load that is connected to the shunt regulator. For supply voltages above 100V, the shunt regulator at INTVCC can be used in both high and low side configurations to provide power to the LTC2946 through an external shunt resistor, RSHUNT. RSHUNT should be sized according to the following equation: VS(MAX) − 5.9V 35mA + – ≤ RSHUNT ≤ VS(MIN) − 6.7V 1mA + ILOAD(MAX) Figure 6a shows a high side power monitor with an input monitoring range of 80V to 200V in a high side shunt regulator configuration. The device ground is separated from circuit ground through RSHUNT and clamped at 6.3V below the input supply, VIN. Note that due to the different ground levels, the I2C signals from the LTC2946 need to be level (1) VIN 80V TO 200V LOAD RSHUNT TO DC590 OR DC2026 Figure 6a. Powering DC2156A from High Side Shunt Regulator to Allow for Input Voltage Higher than 100V RSNS + – 80V TO 200V SENSE + SENSE – LOAD VDD 3k INTVCC ADIN 300k LTC2946 GND RSHUNT Figure 6b. Powering LTC2946 from High Side Shunt Regulator to Allow for Input Voltage Higher than 100V dc2156af 7 DEMO MANUAL DC2156A Hardware Setup Options shifted for communication with other ground referenced components. The DC590, as well as the Linduino™, provide the necessary isolation in this case. The bus voltage can be measured with an appropriate external divider connected to ADIN for full scale operation at 200V. Make sure to set CA[7] in the CTRLA register so that the ADC measures ADIN with reference to INTVCC instead of the GND pin. Figure 7a shows a high side rail-to-rail power monitor which derives power from a greater than 100V secondary supply. The voltage at INTVCC is clamped at 6.3V above ground in a low side shunt regulator configuration to power the part. 0V TO 75V LOAD RSHUNT 5.1K + – TO DC590 OR DC2026 80V TO 200V Figure 7a. DC2156A Derives Power from Low Side Shunt Regulator in High Side Current Sense Topology RSNS + – 0V TO 75V SENSE + SENSE – LOAD INTVCC >100V RSHUNT 5.1k LTC2946 VDD GND Figure 7b. DC2156A Derives Power from Low Side Shunt Regulator in High Side Current Sense Topology 8 dc2156af DEMO MANUAL DC2156A Hardware Setup Options In low side power monitors, the device ground and the current sense inputs are connected to the negative terminal of the input supply as shown in Figure 8a. The low side shunt regulator configuration allows operation with input supplies above 100V by clamping the voltage at INTVCC. + – LOAD VIN 80V TO 200V RSHUNT 5.1k TO DC590 OR DC2026 Figure 8a. DC2156A Derives Power through Low Side Shunt Regulator in Low Side Current Sense Topology RSHUNT 5.1k INTVCC LOAD VDD + – VIN 80V TO 200V LTC2946 GND SENSE – SENSE + RSNS Figure 8b. LTC2946 Derives Power through Low Side Shunt Regulator in Low Side Current Sense Topology dc2156af 9 DEMO MANUAL DC2156A Hardware Setup Options -48V System Monitoring -48V return tied to EXTVDD. The DC590 provides isolation and level shifting, as the I2C interface is operating at -48V with respect to -48V RTN, which is normally near earth ground potential. The DC2156A can also be configured to provide power monitoring in -48V Telecom applications by setting JP1 to EXTVDD, with the -48V input tied to VOUT and GND and the RTN RTN + – LOAD 4V TO 75V –48V OUTPUT –48V INPUT TO DC590 OR DC2026 Figure 9a. Current Monitoring in a –48V System –48V RTN VDD + – 4V TO 75V LTC2946 GND –48V INPUT SENSE – LOAD SENSE + RSNS –48V OUTPUT Figure 9b. Current Monitoring in a –48V System 10 dc2156af DEMO MANUAL DC2156A Quick Start Procedure The various features of DC2156A can be demonstrated by using Linear Technology’s QuikEval Software. QuikEval is a USB-based product demonstration and data acquisition software meant to be used in conjunction with the DC590 that connects to individual daughter cards for specific Linear Technology products. This software can be found on the Linear Technology website at: http://ltspice.linear.com/software/ltcqev.exe Connect the DC590 to the PC using the USB cable provided with the DC590. Now, connect the DC590 to the DC2156A. The setup should look like Figure 10. Ensure power is applied to the DC2156A in any one of the configurations described earlier in this manual and that a load is connected to the board. Once setup is complete, run the QuikEval Software. QuikEval should auto-detect the DC2156A and provide the user with a control panel. 48V POWER SUPPLY – + PC 5A ELECTRONIC LOAD GND DC590 VIN VOUT – + DC2156A GND Figure 10. Hardware Bench Setup Interfacing with the DC2026 This board can also interface with the DC2026 Linduino board which is part of the Linduino Firmware Development Program. The Linduino Firmware Development Program provides users with convenient driver code, written in C, for a wide range of LTC products. Please see the Linduino page for more details. The DC2026 comes preloaded with a DC590 emulator firmware which allows easy interface with QuikEval. See Figure 10 for connections but substitute the DC590 with the DC2026. QuikEval will launch the GUI as it would with the DC590. The DC2026 can also be used as a development platform, example software along with drivers can be found on the product landing page: http://www.linear. com/product/LTC2946. dc2156af 11 DEMO MANUAL DC2156A DC2156A SOFTWARE USER INTERFACE The DC2156A software user interface was designed to allow the user to quickly evaluate the LTC2946. The user has the ability to set fault thresholds, enable/disable and clear alerts, change the source for the VIN measurement as well as monitor voltage, current, power, charge and energy. RSNS is set to 20mΩ by default on the DC2156A, should any changes be made on the board, the corresponding value should be entered into the software control panel. By pressing Start, the software interface will begin using the DC590 for data collection. The LTC2946 software UI is split up into two main components. The Data Acquisition Terminal and a Tabbed Interface. A screen shot of the GUI is shown in Figure 11. Figure 11. LTC2946 Software UI Data Acquisition Terminal The Data Acquisition Terminal display is always in view of the user, providing convenient controls to quickly perform common functions and displaying real time voltage, current, power, charge and energy data. The Data Acquisition Terminal consists of the following components. Performance Graph The performance graph plots data in real time for up to the last minute. Older data, once scrolled off the screen, 12 is discarded. The user can choose to log all the data in a .csv file by clicking on the logging checkbox which is also found on the Data Acquisition Terminal. The performance graph can plot any two quantities from VIN, Current, ADIN, Power, Energy and Charge concurrently on the same plot. Radio buttons located next to the plot allow the user to select which quantity to plot on a particular axis. The axes are color coded. The left axis will always be plotted lime green and the right axis will always be plotted in red. These color codes are conveniently placed next to the radio buttons for user reference. dc2156af DEMO MANUAL DC2156A DC2156A SOFTWARE USER INTERFACE Figure 12. Performance Graph Note: You cannot plot the same quantity on both axes. Attempting to do so will result in the next available quantity being selected instead. Measurement Panel The measurement panel provides text based output of VIN and ADIN registers in volts, current registers in amperes and power registers in watts. For each quantity this panel displays the values of the maximum and minimum registers, the high and low limit threshold registers and the real time reading register. These values get updated with each polling of the device if there is any change. Figure 13. Measurement Panel dc2156af 13 DEMO MANUAL DC2156A DC2156A SOFTWARE USER INTERFACE Accumulator Panel The onboard accumulators have their own dedicated panel which displays the charge, energy and time base register values. The GUI takes this one step further by providing the user with two extra text boxes which depict the average current and power from the time the control panel initiated the polling of the device. These values get updated with each polling of the device if there is any change. then these text boxes should be updated to reflect that change to get proper scaling. If no scaling is desired or if the ADIN pin is to be connected directly to a voltage source of up to 2.048V then the “R2 = 0 Ohms” checkbox can be checked to eliminate the internal scaling present in the GUI. Figure 15. Resistor Menu Setup and Quick Controls Panel Figure 14. Accumulator Panel ADIN Resistor Panel The ADIN pin on the demo board has a resistive divider, in the form of R2 and R10, which allows the user to measure voltages up to 102V. Since the ADIN pin has a full-scale voltage of 2.048V, the voltage displayed is scaled internally by the GUI based on the values entered in the R2 and R10 text boxes. If the values of the onboard resistors changed, The Setup and Quick Controls panel allows the user to quickly change the sense resistor value (this must match the sense resistor present on the board), clear fault registers as well as the maximum and minimum registers of all quantities, set the device address, perform ARA in the case of an alert, as well as put the part in snapshot mode. There are two special checkboxes present in the Setup and Quick Controls panel which require further explanation. Figure 16. Setup and Quick Controls 14 dc2156af DEMO MANUAL DC2156A DC2156A SOFTWARE USER INTERFACE The Logging checkbox, once checked, will enable the GUI to store VIN, ADIN, current, power, energy and charge register values in a user defined .csv file. It will also log the value of the fault register (in hexadecimal) so that the user can see at what particular instant the fault register changed value during a fault. Note that this checkbox greys out once the start button is clicked and must be selected before the start button is clicked if logging is desired. The Restore Accumulators checkbox enables the user to individually clear accumulator overflow faults while still retaining values. Each accumulator in the LTC2946 has its own dedicated status and fault bits. Status bits represent real-time status of the part. If a fault occurs and then goes away, the status bit would get set and then reset with the fault event. The fault bit would stay latched. The accumulator status bits behave slightly differently in the sense that they stay latched once an accumulator overflows and do not get reset until the accumulator itself is reset. This is because an accumulator is still in overflow state once it rolls over until it is reset. The only way to reset the accumulators is by setting bits CB[1:0] to either 10 or 11. This however resets ALL of the accumulator registers. To prevent this from happening and to allow the user to only reset a single accumulator fault, the Restore Accumulators checkbox first stores the information from all the accumulators, resets the accumulators and then restores the accumulator values in the accumulator registers which were not selected to be reset. Alert/Fault Mask LEDs In order to provide a friendly user interface, the LTC2946 abstracts the ALERT mask and FAULT registers from the user in the form of clickable LEDs. Each LED maps to a corresponding bit in the ALERT and FAULT registers. For example, the POWER OVERVALUE LED maps to bit 7 in the ALERT1 and FAULT1 registers. Similarly, the GPIO1 Input Fault LED maps to Bit 6 in the ALERT2 and FAULT2 registers and so forth. Figure 17. Alert/Fault Mark LEDs The LEDs have three states which indicate the status of the FAULT and ALERT registers. An inactive LED, represented with a grey color, indicates that neither the alert bit nor the corresponding fault bit is set. An armed LED, represented with a green color, indicates that the corresponding alert bit has been set, however no fault event has occurred. This arms the ALERT# pin to pull low if that particular fault event occurs. A faulted LED, represented with a red color, indicates that the corresponding fault bit has been set. Clicking on a faulted LED will clear that fault by resetting the corresponding fault bit. The LED will then return to its previous state whether it was inactive or armed. dc2156af 15 DEMO MANUAL DC2156A DC2156A SOFTWARE USER INTERFACE Tab Interface Control Register B and GPIO Control The tabbed interface allows the user to cycle between the various control and threshold registers of the LTC2946 without losing view of the data. It consists of the following three tabs. This tab provides access to the CTRLB and allows control of the GPIO pins through registers GPIO_CFG and GPIO3_CTRL. Control Register A As the name suggests, this tab gives the user direct access to the CTRLA register in the form of radio buttons. Here, the user can configure the ADIN pin reference, offset calibration, voltage channel as well as the duty cycle of measurements easily. The CTRLB register can be used to put the part in shutdown mode as well as to configure handling of fault events. The state of the individual GPIO pins can also be configured through this tab. Figure 19. Control Register B and GPIO Control Figure 18. Control Register A 16 dc2156af DEMO MANUAL DC2156A DC2156A SOFTWARE USER INTERFACE Threshold and Initial Values This tab provides access to the threshold registers within the LTC2946. The user can set the maximum and minimum thresholds of power, current, VIN and ADIN here by entering the desired value and then clicking the corresponding button. Once the button is clicked, the data is first validated. If it is out of range a message box will pop up and request the user to enter data within the valid range. Once valid data is sent to the part, the corresponding text box in the Measurements Panel will be updated to reflect this change. The user can also set the initial values for the accumulators here. The time base is entered in hexadecimal format while the charge and energy values are entered in coulombs and joules, respectively. Similar to the threshold section, the information must be sent by clicking on the corresponding button so that the data is first validated and then sent to the part. This tab also allows the user to set the frequency of their crystal oscillator if they are using one. The demo board comes equipped with a 4MHz clock which is the default value. If no external clock is desired, the crystal present on the demo board can be removed and the “Use LTC2946’s Internal Clock (5% Trimmed 250kHz)” checkbox can be selected to use the part’s internal clock. Figure 20. Threshold and Initial Values dc2156af 17 DEMO MANUAL DC2156A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X7R 0.1µF 200V 10% 1206 AVX, 12062C104KAT2A Required Circuit Components 1 1 C1 2 2 C2, C5 CAP., X5R 0.1µF 25V 10% 0603 AVX, 06033D104KAT2A 3 2 C3, C4 CAP., C0G, 36pF 25V 5% 0603 AVX, 06033A360JAT2A 4 1 D1 VOLTAGE SUPPRESSOR, 70V Diodes/Zetex, SMAT70A 5 2 D2, D3 LED, GRN PLCC-2 (B-SIZE) Vishay, VLMC3101-GS08 6 1 D4 LED, AMBER PLCC-2 (B-SIZE) Vishay, VLMH3100-GS08 7 1 D5 LED, RED PLCC-2 (B-SIZE) Vishay, VLMS3000-GS08 8 1 D6 DIODE, DUAL SCHOTTKY, SOT-23 Fairchild, BAT54C 9 4 E1, E2, E3, E4 TP, TURRET, .094" Mill-Max, 2501-2-00-80-00-00-07-0 10 15 E5–E19 TP, TURRET, .064" Mill-Max, 2308-2-00-80-00-00-07-0 11 3 JP1, JP2, JP3 HEADERS, DBL. ROW 2 X 3 2mm CTRS. Sullins, NRPN032PAEN-RC 12 4 J1, J2, J3, J4 BANANA JACK, NON-INSULATED Keystone, 575-4 13 1 J5 CONN., HEADER, 14 PIN, 2mm Molex, 87831-1420 14 1 Q1 MOSFET N-CHAN,60V 115MA SOT23 Diodes/Zetex, 2N7002-7-F 15 1 RSNS RES., LRC 0.020Ω 1.0W 1% 2010 IRC, LRF20 10LF-01-R020-F 16 1 R1 RES., CHIP 51Ω 0.1W 5% 0603 Vishay, CRCW060351R0JNEA 17 1 R2 RES., CHIP 147k 0.1W 1% 0603 Vishay, CRCW0603147KFKEA 18 4 R3, R5, R7, R9 RES., CHIP 3.3k 0.1W 5% 0603 Vishay, CRCW06033K30JNEA 19 3 R4, R6, R8 RES., CHIP 100k 0.1W 5% 0603 Vishay, CRCW0603100KJNEA 20 1 R10 RES., CHIP 3k 0.1W 1% 0603 Vishay, CRCW06033K00FKEA 21 0 R11, R12 RES, 0603 Opt 22 1 R14 RES, 0Ω, 0603 Vishay, CRCW0603000JNEA 23 3 R15, R16, R17 RES., CHIP 5.1k 0.1W 5% 0603 Vishay, CRCW06035K10JNEA 24 1 U1 I.C., POWER MONITOR, DFN16DE-4X3 Linear Technology, LTC2946IDE 25 1 U2 I.C., SERIAL EEPROM TSSOP-8 Microchip, 24LC025-I/ST 26 1 Y1 XTAL, 4 MHz, Y-ABLS Abracon Corp., ABLS-4.000MHz-B2-T 28 3 SHUNTS AS SHOWN ON ASSY DWG SHUNT, 2mm CTRS. Samtec 2SN-BK-G 29 4 MH1–MH4 STAND-OFF, NYLON 0.25" Keystone, 8831 (SNAP ON) 18 dc2156af D C B VIN E2 E13 E12 E11 E10 E9 1 V+ 2 5V 6 CS 4 SCK/SCL 7 MOSI/SDA 5 MISO 10 EEVCC 9 EESDA 11 EESCL 12 EEGND 14 AUX J5 VPU Q1 2N7002 R6 100k VGPIO D6 BAT54C 3 D3 GRN R5 3.3k 2 4 6 HD2X3-079 1 3 5 D4 AMBER R7 3.3k INTVCC VIN EXTVDD INTVCC JP1 R8 100k R1 51 1 2 D5 RED R9 3.3k C2 0.1uF WP R15 5.1k EEGND R16 5.1k R17 5.1k 6 5 7 3 2 1 SCL SDA WP A2 A1 A0 U2 24LC025-I /ST DC590 I2C INTERFACE 2 1 R4 100k D1 SMAT70A NOTE: EEPROM FOR BOARD IDENTIFICATION HD2X7-079-MOLEX 1 2 D2 GRN R3 3.3k VGPIO TO DC590B VPU 2.5V - 5.5V GND (ALERT) GPIO3 (ACC) GPIO2 GPIO1 1 INTVCC E5 EXTVDD 4V - 100V INTVCC E6 2.7V - 5.9V GND J2 E1 2 1 0V - 75V 2 21 3 2 1 A ARRAY VIN EEPROM J1 13 8 GND 3 GND GND 2 1 8 VCC GND Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 2 4 1 C5 0.1uF C1 0.1uF 200V 1206 VDD INTVCC GPIO1 GPIO2 GPIO3 SDAO SDAI SCL R12 OPT VPU R14 0 R11 OPT VPU 17 EP SENSE+ SENSEADR1 ADIN ADRO GND CLKOUT CLKIN 16 15 14 13 12 11 10 9 E17 E15 E16 E14 SDAO SDAI GND SCL Y1 C3 36pF 1 CUSTOMER NOTICE ADRO HIGH FLOAT HIGH FLOAT FLOAT LOW HIGH LOW LOW ADR1 LOW HIGH HIGH FLOAT LOW HIGH FLOAT FLOAT LOW 5 3 1 JP3 HD2X3-079 6 4 2 ADR1 2 REV DESCRIPTION 5 HIGH FLOAT LOW R10 3k R2 147k VOUT E4 E3 E8 E7 J4 J3 SAL H. 4 SCALE = NONE SAL H. KIM T. DATE: N/A SIZE IC NO. LTC2946IDE DEMO CIRCUIT 2156A 05/28/2014, 05:25 PM 5 SHEET WIDE RANGE I2C POWER MONITOR WITH ENERGY AND COULOMB METER TITLE: SCHEMATIC TECHNOLOGY VOUT GND 5A, ADJ. GND 1 OF 1 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. INSTALL SHUNTS AS SHOWN. DATE 05-28-14 ADIN APPROVED REVISION HISTORY PRODUCTION * DEFAULT ADDRESS CE D0 D2 D4 D6 D8 DA DC DE* JUMPER POSITIONS HIGH FLOAT LOW __ ECO NOTES: UNLESS OTHERWISE SPECIFIED Figure 21. DC2156A Demo Circuit Schematic 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 3 1 JP2 HD2X3-079 6 4 2 ADR0 4 APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 2 2010 C4 36pF E19 E18 RSNS 0.02 SENSE- SENSE+ REMOVE R14 TO SEPERATE SDAI AND SDAO 1 2 3 4 5 6 7 8 U1 LTC2946IDE 3 D C B A DEMO MANUAL DC2156A Schematic Diagram dc2156af 19 DEMO MANUAL DC2156A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 20 Linear Technology Corporation dc2156af LT 0814 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014