MAXREFDES179
概览
设计资源
描述
The MAXREFDES179 reference design board is a standalone 27W/45W USB type-C PD fast-charger, fuel-gauge, and protection solution for 2S Li+ batteries. It also provides 8A output at a voltage of 1S very efficiently to power systems with power management integrated circuits (PMICs) designed for 1S voltages.
The MAXREFDES179 allows the easy evaluation of the USB-C PD controller, buck-boost charger, fuel gauge with integrated protection, and 2S-to-1S switched-capacitor converter.
The MAX77958 is a complete solution to detect the USB type-C CC and implement the PD protocol. The MAX77960/MAX77961 is a 27W/45W wide-input buck-boost charger with integrated field-effect transistors (FETs) for 2S Li+ batteries. The MAX77932 is a dual-phase switched-capacitor converter with integrated power switches that delivers 8A output current and divides the input voltage by two. The MAX77932 also simplifies the migration by converting the 2S battery voltage to 1S-equivalent output and preserves the existing downstream 1S power architecture. The MAX17320 is a fuel-gauge IC with a protector and SHA-256 authentication for two to four series lithium-ion/polymer batteries. The fuel gauge uses the ModelGauge m5 algorithm that automatically compensates for cell aging, temperature, and discharge rate, and provides accurate state-of-charge (SOC) in milliampere-hours (mAh) or percentage (%) over a wide range of operating conditions to protect the battery.
The graphical user interface (GUI) is Windows-based. A register-based interface exercises the features of the MAX77932, MAX77958, MAX77960/MAX77961, and MAX17320.
The design files, firmware, and software are available in the Design Resources tab. The board is also available for purchase.
优势和特点
- Input operating range of 3.5V to 25V
- Type-C and USB-PD support
- DRP and Try,Snk state
- Cable orientation, power role detection
- Integrated VCONN switch with OCP
- Autonegotiate for the highest PD power profile (45W) when Sink
- Autoenable OTG when Source
- Autoconfigurable battery charger
- AP control to overwrite PD power profile, OTG limit, USB-PD functions, buck-boost charger configuration, read/write MAX17320 fuel gauge status, configure MAX77932 switched capacitor converter
详情
- MAXREFDES179 reference design board package (Figure 2)
- MAXREFDES179 reference design board and Micro-B USB cable
- MAXREFDES179 Battery Power and MAXREFDES179 Battery Fuel Gauge software (GUI)
- Oscilloscope
- Battery simulator
- Voltage and current multimeters
- USB-C PD power adapter (USB compliant) and USB-C to on-the-go (OTG) cable
- PC with Windows 10 operating system
Figure 1. System Board
Figure 2. MAXREFDES179 Block Diagram
The reference design board is fully assembled and tested. Follow the steps to verify the board operation:
- Identify the connections and test points (Figure 1). Confirm all the shunts and jumpers are at their default positions (Table 1).
- Install the MAXREFDES179 Battery Power and MAXREFDES179 Battery Fuel Gauge software (GUI) on the PC.
- Connect the Micro-B USB cable from the PC to the MAXREFDES179 reference design board. The Light-Emitting Diodes (LEDs) light up. Figure 3 shows the driver is installed properly.
- Set up the test circuit (Figure 4). Preset the battery simulator to 7.4V and current limit to 100mA.
- Toggle SW2 to wake the MAX17320 fuel gauge (needed only to power cycle the board).
- Ensure the battery sourcing current is low (<100mA). Then only increase the current limit to 5A.
- Start the MAXREFDES179 Battery Power GUI and click Connect. A pop-up message indicates the successful connection (Figure 5). Proceed with Read and Close.
- Start the MAXREFDES179 Battery Fuel Gauge GUI. It automatically connects to the reference design.
- Read the status of the USBC, charger, 2S to 1S battery voltage conversion, and fuel gauge.
- MAX77958 USBC tab → Interrupts, Status, Command (Figure 6 and Figure 7).
- MAX77960/MAX77961 Charger tab → Interrupts/Status, Configurations (Figure 8 and Figure 9).
- MAX77932 tab → Status, Configurations (Figure 10 and Figure 11).
- MAXREFDES179 Battery Fuel Gauge → ModelGauge m5, protector, graphs, etc. (Figure 12)
- The reference design completes its initialization. The VBUS, VSYS, and I2C pull up. The CC pin waveforms can be monitored using the oscilloscope (Figure 13).
Figure 3. Safely remove hardware.
Figure 4. Quick start connection diagram.
Figure 5. MAXREFDES179 Battery Power GUI connection.
Figure 6. USB-C status.
Figure 7. USB-C interrupts.
Figure 8. Charger interrupts_status.
Figure 9. Charger configurations.
Figure 10. MAX77932 status.
Figure 11. MAX77932 configurations.
Figure 12. MAXREFDES179 Battery Fuel Gauge GUI.
Figure 13. Waveform after initialization.
Tools & Simulations
Software Development
文件和资源
支持与培训
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