Atmel AVR473: ATAVRSB202 Hardware User Guide Features 8-bit Atmel Atmel ATmega32HVB Smart Battery device evaluation and development kit Microcontrollers High-side N-FETs 5m sense resistor current measurements with 18-bit CC-ADC Input filters for cell voltages to the 12-bit voltage ADC All components on one side Application Note 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 Atmel ATAVRSB202 Smart Battery board is an evaluation and development kit for the new Atmel AVR Smart Battery device, the Atmel ATmega32HVB. This device is made for battery packs with two, three, or four lithium-ion and lithium- polymer cells in series, 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 the Atmel AVR474 application note. The boards have an edge connector for connection to the Atmel ATAVRSB200 demonstation board, but can for development purposes also be used standalone. Figure 1-1. Atmel SB202 evaluation kit. Rev. 8230A-AVR-03/11 2 Hardware The Atmel SB202 board consists 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. SB202 block layout. 2.1 Main area The main area contains the Atmel ATmega32HVB device, charge and discharge N- FETs, 5m 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 three pin headers with 1x2, 1x5, and 2x12 pins to give access to several signals and device pins, as shown in Table 2-1, Table 2-2, and Table 2-3. Pin headers with 2.54mm spacing or wires can be soldered in here. A connector for in-circuit programming is surface mounted. Lastly, the area contains a board ID system, which is described in more details in the following subsections. Table 2-1. Signals that can be found on the 1x2 pin header holes. Name Description PACK+ (J1) Battery-pack positive input/output. Also connected to BATT pin PACK- (J2) Battery-pack negative input/output (ground) Table 2-2. Signals that can be found on the 1x5 pin header holes. Name Description CELL+/ PV4 (J3) Cell stack positive terminal. / Cell4 positive input PV3 (J4) Cell3 positive input PV2 (J5) Cell2 positive input 2 Atmel AVR473 8230A-AVR-03/11