BQ34Z100EVM

Table of Contents www.ti.com User’s Guide bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Tom Cosby HVAL - Battery Management Solutions ABSTRACT This evaluation module (EVM) is a complete evaluation system for the bq34z100 wide-range fuel gauge for lithium ion, Nickel metal hydride (NiMH) and Nickel Cadmium (NiCd) chemistries when combined with an EV2300 USB adapter and Microsoft® Windows® based PC software downloadable from the TI.com website. The circuit module includes one bq34z100 integrated circuit (IC) and all other components necessary to monitor and predict capacity in one or more series cell Li-ion, Li-polymer, or LiFePO4 battery packs. The minimum series cell count for PbA, NiMH, and NiCd chemistries must exceed 3.3-V stack voltage. The circuit module connects directly across the battery stack. With the EV2300 interface adapter and software, it is possible to read the bq34z100 data registers, program the chip for different pack configurations, log cycling data for further evaluation, and evaluate the overall functionality of the bq34z100 solution under different charge and discharge conditions. Table of Contents 1 Features...................................................................................................................................................................................3 1.1 Kit Contents........................................................................................................................................................................3 1.2 Ordering Information.......................................................................................................................................................... 3 1.3 Documentation................................................................................................................................................................... 3 1.4 bq34z100 Circuit Module Performance Specification Summary........................................................................................ 3 2 bq34z100 Quick Start Guide.................................................................................................................................................. 4 2.1 Items Needed for EVM Setup and Evaluation....................................................................................................................4 2.2 Software Installation...........................................................................................................................................................4 2.3 EVM Connections.............................................................................................................................................................. 5 3 Battery Management Studio.................................................................................................................................................. 7 3.1 Registers Screen................................................................................................................................................................7 3.2 Setting Programmable bq34z100 Options......................................................................................................................... 8 3.3 Calibration Screen..............................................................................................................................................................9 3.4 Chemistry Screen.............................................................................................................................................................10 3.5 Programming Screen........................................................................................................................................................11 3.6 Golden Image Screen...................................................................................................................................................... 12 3.7 Advanced Comm I2C Screen...........................................................................................................................................13 3.8 Send HDQ Screen........................................................................................................................................................... 15 3.9 Dashboard Panel............................................................................................................................................................. 15 3.10 Commands Panel...........................................................................................................................................................16 4 Circuit Module Physical Layouts.........................................................................................................................................17 4.1 Board Layout....................................................................................................................................................................17 4.2 Schematic........................................................................................................................................................................ 20 4.3 Bill of Materials.................................................................................................................................................................21 5 Related Documentation from Texas Instruments.............................................................................................................. 22 6 Revision History................................................................................................................................................................... 22 List of Figures Figure 2-1. bq34z100 Circuit Module Connection to Cells and System Load and Charger........................................................ 5 Figure 3-1. Registers Screen.......................................................................................................................................................7 Figure 3-2. Data Memory Screen................................................................................................................................................ 8 Figure 3-3. Calibration Screen.....................................................................................................................................................9 SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated 1 Trademarks www.ti.com Figure 3-4. Chemistry Screen....................................................................................................................................................10 Figure 3-5. Programming Screen...............................................................................................................................................11 Figure 3-6. Golden Image Screen............................................................................................................................................. 12 Figure 3-7. Advanced Comm Screen........................................................................................................................................ 13 Figure 3-8. Send HDQ Screen...................................................................................................................................................15 Figure 4-1. Top Silk Screen....................................................................................................................................................... 17 Figure 4-2. Top Assembly.......................................................................................................................................................... 17 Figure 4-3. Top Layer.................................................................................................................................................................18 Figure 4-4. Internal Layer 1....................................................................................................................................................... 18 Figure 4-5. Internal Layer 2....................................................................................................................................................... 19 Figure 4-6. Bottom Layer........................................................................................................................................................... 19 Figure 4-7. bq34z100EVM-003 Schematic................................................................................................................................20 List of Tables Table 1-1. Ordering Information................................................................................................................................................... 3 Table 4-1. Bill of Materials..........................................................................................................................................................21 Trademarks Impedance Track™ is a trademark of Texas Instruments. Microsoft® and Windows® are registered trademarks of Microsoft Corporation. All trademarks are the property of their respective owners. 2 bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback www.ti.com Features 1 Features • • • Complete evaluation system for the bq34z100 advanced gas gauge with Impedance Track™ technology. Populated circuit module for quick setup Link to software allowing data logging for system analysis 1.1 Kit Contents • • bq34z100 circuit module Cable to connect the EVM to an EV2300 or EV2400 Communications Interface Adapter. 1.2 Ordering Information Table 1-1. Ordering Information EVM Part Number Chemistry Configuration Capacity bq34z100EVM Li-Ion, Li-Polymer, LiFePO4, PbA, NiMH, NiCd 3 V–48 V Any 1.3 Documentation See the device data sheet for bq34z100-G1 (SLUSBZ5) on www.ti.com for information on device firmware and hardware. 1.4 bq34z100 Circuit Module Performance Specification Summary This section summarizes the performance specifications of the bq34z100 circuit module. Specification Min Typ Max Input voltage BAT+ to BAT– in 1S mode 3 4 5 V Input voltage BAT+ to BAT– in MultiCell 6 28 48 V Charge and discharge current 0 2 7 A SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback Unit bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated 3 bq34z100 Quick Start Guide www.ti.com 2 bq34z100 Quick Start Guide This section provides the step-by-step procedures required to take a new EVM and configure it for operation in a laboratory environment. 2.1 Items Needed for EVM Setup and Evaluation • • • • • • • • bq34z100 circuit module EV2300 or EV2400 Communications Interface Adapter Cable to connect the EVM to an EV2300 or EV2400 Communications Interface Adapter USB cable to the Communications Interface Adapter to the computer Computer setup with Windows XP, or higher, operating system Access to the internet to download the Battery Management Studio software setup program Battery cells or 1-kΩ resistors to configure a cell simulator A DC power supply that can supply 50 V and 3 A (Constant current/constant voltage capability is desirable) 2.2 Software Installation Find the latest software version in the bq34z100 tool folder on www.ti.com. Use the following steps to install the bq34z100-G1 Battery Management Studio software: 1. Download and run the Battery Management Studio setup program from the bqStudio product folder on www.ti.com. See Section 3 for detailed information on using the tools in the Battery Management Studio. 2. If the Communications Interface Adapter was not previously installed, after the Battery Management Studio installation, a TI USB driver installer pops up. Click “Yes” for the agreement message and follow the instructions. Two drivers are associated with the EV2300 and an additional file may be required for the EV2400. Follow the instructions to install both. Do not reboot the computer, even if asked to do so. 3. Plug the Communications Interface Adapter into a USB port using the USB cable. The Windows system may show a prompt that new hardware has been found. When asked, "Can Windows connect to Windows Update to search for software?", select "No, not this time", and click "Next". In the next dialog window, it indicates "This wizard helps you install software for: TI USB Firmware Updater". Select "Install the software automatically (Recommended)" and click "Next". It is common for the next screen to be the Confirm File Replace screen. Click "No" to continue. If this screen does not appear, then go to the next step. After Windows indicates that the installation was finished, a similar dialog window pops up to install the second driver. Proceed with the same installation preference as the first one. The second driver is the TI USB bq80xx Driver. 4 bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback bq34z100 Quick Start Guide www.ti.com 2.3 EVM Connections This section covers the hardware connections for the EVM (see Figure 2-1). Figure 2-1. bq34z100 Circuit Module Connection to Cells and System Load and Charger • Direct connection to the cells: BAT–, BAT+ The bq34z100 monitors the cell stack voltage. Connect the bottom of the stack to BAT– and the top of the stack to BAT+. The stack voltage can range from 3 V to 48 V (see Figure 2-1). STACK VOLTAGE J5 HEADER J2 HEADER Less than 5 V < 5-V jumpers N/A Greater than 5 V > 5-V jumpers 16 V, 32 V or 48 V WARNING Applying a voltage greater than 5 V when jumpers are configured to < 5-V operation will damage the IC. Do not apply power until you have completed the EVM Connections section. • To the serial communications port (SCL, SDA) • Attach the Communications Interface Adapter cable to the J7 terminal block and to an EV2300 or EV2400 adapter box. Connect the PC USB cable to the EV2300 or EV2400 and the PC USB port (see Figure 2-1). The charger and system load connection across BAT+ and PACK– • Attach the charger or load to the TB3 terminal block. Connect the positive load wire to BAT+ and the ground wire for the load to PACK– (see Figure 2-1). The ALERT output The ALERT output is an active low interrupt. The ALERT Configuration register selects the Control Status bits that will activate the interrupt. The ALERT pin is an open drain output and a pull-up resistor must be attached to the TB1 to use the feature. SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated 5 bq34z100 Quick Start Guide www.ti.com • The LED Configuration • When configuring the data flash registers, choose one of five LED/Comm configuration codes (refer to Table 21 in the bq34z100-G1 datasheet SLUSBZ5). After reviewing those possibilities, select the jumper pattern desired for the J6 header on the EVM. For single LED mode, place a jumper on the pair marked A. For four direct LED mode, place jumpers on A, B, C, and D. (Note: This configuration is only available when using HDQ communications mode.) For external LEDs using the shift register option, place a single jumper on EXT. In all cases, where one or more LED’s are used, place a jumper across the J1 header to provide power to the LED (see Figure 2-1). Parameter setup The default data flash settings configure the device for 1-series Li-Ion cell. The user must update the data to set up the number of series cells to match the physical pack configuration (see Cell Configuration in Section 3.2). This provides basic functionality to the setup. Other data flash parameters should also be updated to fine tune the gauge to the pack. See the bq34z100 datasheet for help with setting the parameters. 6 bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback www.ti.com Battery Management Studio 3 Battery Management Studio 3.1 Registers Screen Apply power to the EVM after you have completed the EVM Connections section. Run Battery Management Studio from the Start | Programs | Texas Instruments | Battery Management Studio menu sequence, or the Battery Management Studio shortcut. The Registers screen (see Figure 3-1) appears. The Registers section contains parameters used to monitor gauging. The Bit Registers section provides a bit-level picture of status and fault registers. A green flag indicates that the bit is 0 (low state) and a red flag indicates that the bit is 1 (high state). Data begins to appear once the Refresh (single-time scan) button is selected, or it scans continuously, if the Scan button is selected. Figure 3-1. Registers Screen The continuous scanning period can be set via the | Window | Preferences | SBS | Scan Interval | menu selection. The Battery Management Studio program provides a logging function which logs the values selected by the Log check boxes located beside each parameter in the Registers section. To enable this function, select the Log button; this causes the Scan button to be selected. When logging is stopped, the Scan button is still selected and has to be manually deselected. SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated 7 www.ti.com Battery Management Studio 3.2 Setting Programmable bq34z100 Options The bq34z100 data flash comes configured per the default settings detailed in the bq34z100 datasheet. Ensure that the settings are correctly changed to match the pack and application for the solution being evaluated. Note The correct setting of these options is essential to get the best performance. The settings can be configured using the Data Memory screen (see Figure 3-2) Figure 3-2. Data Memory Screen 3.2.1 Cell Configuration The bq34z100 operates in one of two modes for measuring battery voltage. Place two jumpers on header J5 to select the mode of operation. Refer to the Section 2.3. For packs where the stack voltage is less than 5 V: • • • Set the Number of Series Cells parameter field to the appropriate value Reset the gauge using the RESET button on the Commands panel Calibrate the stack voltage. Reference the Calibration Screen section For packs where the stack voltage is greater than 5 V: • • • • 8 Set the Number of Series Cells parameter field to the appropriate value Set the VOLTSEL bit in the Pack Cfg A register Reset the gauge using the RESET button on the Commands panel Calibrate the stack voltage. Reference the Calibration Screensection bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback www.ti.com Battery Management Studio 3.3 Calibration Screen Calibrate the voltages, temperatures, and currents to provide good gauging performance. Press the Calibration button to select the Advanced Calibration window. See Figure 3-3. Figure 3-3. Calibration Screen 3.3.1 Voltage Calibration • • • Measure the voltage from BAT+ to BAT– and enter this value in the Applied Voltage field and select the Calibrate Voltage box. Press the Calibrate Gas Gauge button to calibrate the voltage measurement system. Deselect the Calibrate Voltage boxes after voltage calibration has completed. 3.3.2 Temperature Calibration • • • Enter the room temperature in the Applied Temperature field and select the Calibrate Temperature box and select the thermistor to be calibrated. The temperature value must be entered in degrees Celsius. Press the Calibrate Gas Gauge button to calibrate the temperature measurement system. Deselect the Calibrate Temperature box after temperature calibration has completed. SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated 9 Battery Management Studio www.ti.com 3.3.3 Current Calibration • • • • • • • Select the Calibrate CC Offset and Calibrate Board Offset boxes and insure that there is no current flow. Press the Calibrate Gas Gauge button to calibrate. Deselect the Calibrate CC Offset and Calibrate Board Offset boxes after current calibration has completed. Connect and measure a 2-A load from BAT+ and PACK– to calibrate the current gain. Enter –2000 in the Applied Current field and select the Calibrate Current box. Press the Calibrate Gas Gauge button to calibrate. Deselect the Calibrate Current box after current calibration has completed. 3.4 Chemistry Screen The chemistry file contains parameters that the simulations use to model the cell and its operating profile. It is critical to program a Chemistry ID that matches the cell into the device. Some of these parameters can be viewed in the Data Flash section of the Battery Management Studio. Press the Chemistry button to select the Chemistry window. See Figure 3-4. Figure 3-4. Chemistry Screen • • • 10 The table can be sorted by clicking the desired column. For example: Click the Chemistry ID column header. Select the ChemID that matches your cell from the table (Figure 3-4). Press the Update chemistry in the data flash button to update the chemistry in the device. bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback www.ti.com Battery Management Studio 3.5 Programming Screen Press the Programming button to select the Programming Update window. This window allows the user to program the device to a new version of firmware. Figure 3-5. Programming Screen 3.5.1 Programming the Flash Memory The upper section of the Programming screen is used to initialize the device by loading the default .srec into the flash memory (see Figure 3-5). • • • • Search for the .srec file using the Browse button. Press the Program button and wait for the download to complete. Press the Execute FW button after the download has completed. Select File | Restart to initialize bqStudio to the new firmware. SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated 11 Battery Management Studio www.ti.com 3.6 Golden Image Screen Press the Golden Image button to select the Golden Image window. This window allows the user to export the device firmware as an .srec, .bq.fs, and .df.fs files. Figure 3-6. Golden Image Screen 3.6.1 Exporting the Flash Memory The .srec file contains the full flash memory. The .bq.fs contains the program memory portion for the flash memory and the .df.fs contains the data flash portion of the flash memory (see Figure 3-6). • • • • 12 Select the directory location to export the files. Enter the file name for the files. Select the files types to export. Press the Create Image File button to export the memory and create the files. bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback Battery Management Studio www.ti.com 3.7 Advanced Comm I2C Screen Press the Advanced Comm I2C button to select the Advanced I2C Comm window. This tool provides access to parameters using I2C and Manufacturing Access commands (see Figure 3-7). Figure 3-7. Advanced Comm Screen 3.7.1 Examples Reading Standard Data Commands. • Read SBData Voltage (0x08) – Start Register = 0x08 – Number of Bytes to Read = 2 – Press the Read button – Date returned =8C 3C, which a byte swapped – 0x3C8C = 15500mV, when converted to decimal Sending a MAC Gauging() to enable IT via ManufacturerAccess(). • With Impedance Track™ disabled, send Gauging() (0x0021) to ManufacturerAccess(). – Start Register = 0x00 – Bytes to Write = 21 00 – Press the Write button – The QEN flag should set in the Control Status register to indicate that Impedance Track is enabled SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated 13 Battery Management Studio www.ti.com Reading Control Subcommands. Chemical ID() (0x0008) via ManufacturerAccess() • 14 Send Chemical ID() to ManufacturerAccess() – Start Register = 0x00 – Bytes to Write = 08 00 – Press the Write button – Start Register = 0x00 – Number of Bytes to Read = 2 – Press the Read button – Date returned =07 01, which a byte swapped – That is 0x0107, chem ID 107 bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback Battery Management Studio www.ti.com 3.8 Send HDQ Screen When using the HDQ single wire serial communication feature, the mode of the gauge must be changed with a special command. This screen provides a button for this purpose. Note the warning message. The process is not reversible. Once in HDQ mode, the HDQ pro screen is available for testing commands and reprogramming the device. For register scanning and data flash access, use the companion evaluation program for HDQ (see Figure 3-8). Figure 3-8. Send HDQ Screen • To the HDQ communications port (HDQ, GND) – Attach the Communications Interface Adapter cable to the J7 terminal block (I2C Interface) to the I2C port on the EV2300.. – Press the Convert From I2C to HDQ button – Power cycle the voltage to the device – Attach the Communications Interface Adapter cable to the J4 terminal block (HDQ Interface) to the HDQ port on the EV2300 – Select File | Restart to reload the bqStudio program WARNING The conversion to HDQ mode is permanent. TI recommends using the I2C interface to setup, calibrate, and run the optimization cycle. 3.9 Dashboard Panel The Dashboard panel displays the device type and firmware version. It also provides updates to the Voltage, SOC, Current and Temperature in one location. The Dashboard uses automatic polling, which can cause problems when sending some MAC commands. Dashboard polling can be disabled by clicking the auto refresh field at the top of the panel (see Figure 3-1). SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated 15 Battery Management Studio www.ti.com 3.10 Commands Panel The Commands panel provides a quick and easy access to frequently used I2C and MAC commands. They are mapped to buttons that can be pressed to execute the function. The I2C transaction is logged in the Log Panel (see Figure 3-1). 16 bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback Circuit Module Physical Layouts www.ti.com 4 Circuit Module Physical Layouts This section contains the printed-circuit board (PCB) layout, assembly drawings, and schematic for the bq34z100 circuit module. 4.1 Board Layout This section shows the dimensions, PCB layers (Figure 4-1 through Figure 4-6), and assembly drawing for the bq34z100 module. TP4 TP5 J7 TP3 TP8 TP7 TP6 U1 U3 J6 J3 J1 J4 J5 RT1 J2 U2 TB3 SW1 TB1 Figure 4-1. Top Silk Screen D15 D14 D9 R9 R10 R11 C3 R35 R36 1 R37 J7 D1 Q6 C1 R7 J6 R34 J3 J1 R33 R16 Q2 D3 1 D10 TP5 TP4 R29 R31 R15 D8 R32 Q1 1 D11 1 U3 U1 D4 R17 TP3 R12 R18 R20 R22 R23 R24 R19 D5 TP8 TP7 TP6 C4 1 D12 D13 R8 D16 D17 D6 J4 R13 R14 J5 1 D2 R21 R28 C8 J2 TP2 C2 C9 U2 C5 C6 C7 R30 TB3 R5 R6 Q7 RT1 R2 R4 R1 R26 R27 1 R3 R25 TP1 Q5 Q4 Q3 D7 SW1 TB1 Figure 4-2. Top Assembly SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated 17 www.ti.com Circuit Module Physical Layouts Figure 4-3. Top Layer Figure 4-4. Internal Layer 1 18 bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback Circuit Module Physical Layouts www.ti.com Figure 4-5. Internal Layer 2 Figure 4-6. Bottom Layer SLUU904B – APRIL 2012 – REVISED APRIL 2021 Submit Document Feedback bq34z100EVM Wide Range Impedance Track™ Enabled Battery Fuel Gauge Solution Copyright © 2021 Texas Instruments Incorporated 19 Circuit Module Physical Layouts www.ti.com 4.2 Schematic Figure 4-7 shows the schematic for this EVM. R2 100K R4 165K 1 Q4 BSS138 1 GND REGIN R35 100 R36 100 R37 100 R34 100 4 J2 1 2 3 4 5 6 Q5 BSS84 R1 R26 300K .1% R27 300K .1% 16V R3 2 3300 pF AGND Vscale Hi Vscale Lo D7 BZT52C5V6S-7 27K P1 GND R41 27K Q3 2N7002 R39 47 Q8 2N7002 4 C2 J5 5V 8 A C1 100 R5 C5 B C D 1uF 0.1uF C7 0.1uF C6 1 SN74HC164PW 1 P1 A VCC 14 B QH 13 LED9 D9 QTLP610C-7 RED R8 1.5K 3 QA QG 12 LED8 D10 QTLP610C-7 RED R9 1.5K 4 QB QF 11 LED7 D11 QTLP610C-7 RED R10 1.5K 5 QC QE 10 LED6 D12 QTLP610C-3 YEL R11 1.5K 6 QD ~CLR 9 7 GND 2 J1 REGIN U3 AGND GND CLK C3 GND 0.1uF R15 0.1uF R16 1.5K 1.5K GND Open for I2C LED A Q1 2SK3019 8 D8 LED B R17 1.5K D3 LED C R19 1.5K D4 LED D QTLP610C-4 GRN 100 QTLP610C-4 GRN R6 QTLP610C-4 GRN SH1 GND D2 AGND TB3 HDQ 1 AZ23C5V6-7 QTLP610C-4 GRN 3 3 2 GND 2 2 4 RT1 10K R7 2M R30 .010 75ppm 1 BAT - R13 100 REG25 >5V SH2 BAT + PACK - 16.5K .1% GND R21 220K R38 1k 7 R28 GND AZ23C5V6-7 R14 100 5 6 GND J7