ATAVRSB200 Microchip

AVR455: ATAVRSB201 User s guide Features 8-bit ATmega16HVA smart battery chip evaluation and development kits. Microcontrollers - ATAVRSB201-1 for Single Series Li-Ion Cell applications. - ATAVRSB201-2 for 2 Series Li-Ion Cell applications. High-side N-FETs. 10 m sense resistor current measurements with the 18-Bit CC-ADC. Application Note Input filters for cell voltages to the 12-bit voltage ADC. All components on one side. Four layer PCB with the reference design part implemented on two layers. Balancing FETs. Polarity safety FET. Holes for mounting of pin headers or wires. ISP connector for programming via SPI, and debugging via debugWIRE interface. 1 Introduction The ATAVRSB201-1/SB201-2 kits are evaluation and development kits for the new Atmel AVR smart battery device ATmega16HVA. This device is made for battery packs with 1 series or 2 series lithium ion and lithium polymer cells, and feature autonomous battery protection as well as very accurate voltage, current and temperature monitoring capabilities. The device provides the means to protect the battery pack and surroundings from hazardous conditions and gain the most from the batteries. The kits consist of both hardware and firmware, with hardware documented here and firmware in application note AVR456. The boards have an edge connector for connection to ATAVRSB200 Smart battery Evaluation kit, but can for development purposes also be used alone. Figure 1-1. SB201-1 Kit. Rev. 8131A-AVR-10/08 2 Hardware The SB201-1 and SB201-2 have a common PCB and only differ in which components are mounted and the silk screen. They will be commonly referred to as SB201 in this document unless differences exist. The SB201 consist of three parts, the edge connector, the main area and the connector and support area. The main area contains all the circuitry needed in a battery pack design. Figure 2-1. SB201 Block layout. 2.1 Main area The main area contain the ATmega16HVA device, charge and discharge N-FETs, 10m sense resistor, decoupling capacitors, filter capacitors/resistors for the voltage and current ADCs and ESD protection. 2.2 Connector and support area The connector area contains holes for two pin headers with 2x6 and 2x2 pins, to give access to several signals and device pins as shown in Table 2-1 and Table 2-2. Pin headers with 2.54mm spacing or wires can be soldered in here. A connector for in- circuit programming is mounted. Lastly the area contains cell balancing and a board ID system, which are described in more details in the next subsections. Table 2-1. Signals that can be found on the 2x6 pin header holes. Name Description PACK+ Battery-pack positive input/output. Also connected to BATT pin. PACK- Battery-pack negative input/output (ground). CELL+ Cell stack positive terminal. CELL- Cell stack negative terminal. VFET VFET pin. VREG Regulator output. Connected to VCC. 2 AVR455 8131A-AVR-10/08 Edge Main Connector and Connector area supporting area