Atmel AVR365 User manual

Atmel AVR365: ATBM302 Hardware User Guide

Features

• Demonstration system for Atmel®ATBM302

• 5mΩsense resistor current measurements with the 18-bit CC-ADC

• Use pre-programmed IC ATBM302

• Cable connector to cells, load and charger

• Communicate with BM300 via SMBus interface

• The components layout in the top layer and bottom layer

1 Introduction

The Atmel ATBM302-EK is the evaluation and development kit for the new Atmel

AVR®Battery Management device ATBM302. The ATBM302 is a battery

management and protection device for lithium-ion batteries. It can be used for 2S,

3S, and 4S application. The ATBM302-EK monitors cell voltage, charge and

discharge current and cell temperature to protect the battery pack. It also includes

gas gauge to calculate the battery’s capacity.

Figure 1-1. ATBM302-EK kit.

8-bit Atmel

Microcontrollers

Application Note

Rev. 8336A-AVR-03/12

2 Atmel AVR365

8336A-AVR-03/12

2 Hardware

The Atmel ATBM302-EK can be divided in two parts: the main area and the

connector area. The main area contains all the components needed in a battery pack.

In the connector area there are four connectors: Cell connector, pack connector, ISP

connector and SMBus connector. Users can connect all the external connections at

these ports. The board size is 100mm × 28.5mm.

Figure 2-1. Main area and connector area.

2.1 Main area

The main area includes all the components used for the battery pack system in the

top layer and bottom layer. Its size is 80mm × 15mm.

2.1.1 Cell balancing

The ATBM302 IC integrates cell balancing FETs. The chip provides one cell

balancing FET for each battery cell in series.

The on-resistance of the cell balancing FET is about 100.

2.1.2 Polarity safety FET

The reverse polarity protection circuit will ensure that the discharge FET (Q3) will turn

off if the charger with reverse polarity connects to the P+ and P-. So the battery can

be ensured to be safe in such cases.

The polarity FET will pull the source of the discharge FET to the negative input

voltage to turn off the discharge FET.

Atmel AVR365

8336A-AVR-03/12

Figure 2-2. The SCH of polarity circuit.

2.1.3 Pre-charge circuit

The Atmel ATBM302 supports two pre-charge methods: Internal pre-charge and

External pre-charge.

If external pre-charge is selected, the external PCH pads in BM303 should be

connected as shown in Figure 2-3, and the parameter ‘PrechargeCircuitSel’ in SMBus

should be configured to 1.

If internal pre-charge is selected, the two pads must be divided. The charger must in

this case control the pre-charge current – either by sensing the voltage level or by

receiving commands from the BM303 to control the current. The parameter

‘PrechargeCircuitSel’ in SMBus must be configured to 0.

Figure 2-3. Pre-charge switch pad.

2.1.4 LED indication

The LEDs in the battery pack is used to indicate the capacity of battery. When the

switch is pushed down, the LEDs will be on for about three seconds. If the capacity is

from 0% to 20%, LED0 will be on, if battery capacity is from 20% to 40%, LED0 and

LED1 will be on etc.

2.1.5 Fuse blowing

In the BM302 the fuse is not mounted on the PCB, pin 1 and pin 3 of fuse are

connected by polygons. The voltage in the PF test point can be monitored to check if

fuse is blown.

To mount a fuse, please cut the polygon in black rectangle first.

4 Atmel AVR365

8336A-AVR-03/12

Figure 2-4. The placement of fuse.

2.1.6 Cell connector

There are two ways to connect cells to the board. Either solder cell wires to the

through-hole pads, or insert cell wires to the connector.

Figure 2-5. Cell connection.

2.1.7 2nd protection IC

In the design an S-8244 IC from Seiko Epson®is used as the 2nd protection IC. If the

voltage of any cell is higher than 4.45V, the S-8244 will send a high voltage signal to

blow the fuse. This action can be detected in PF test point. If the fuse is blown, the PF

voltage will be changed from high to low.

2.2 Connector and pin description

The connectors provide a quick and secure connection to the demonstration board.

2.2.1 Connectors

The following connectors are available:

•Cell connector(1-, 1+, 2+, 3+, 4+)

•Pack connector to P+ and P-

•ISP connector to download firmware to IC

•SMBus communication connector to BM300 (SDA, SCL, GND)

Atmel AVR365

8336A-AVR-03/12

2.2.2 Pin description

Table 2-1. Cell connector (TB1, TB2).

Name Description

1- Cell1 negative terminal

1+ Cell1 positive terminal, Cell2 negative terminal

2+ Cell2 positive terminal, Cell3 negative terminal

3+ Cell3 positive terminal, Cell4 negative terminal

4+ Cell4 positive terminal

Table 2-2. ISP connector signals (J2).

Name Pin number Description

MISO 1 Serial data out

VCC 2 Supply voltage

SCK 3 Serial clock

MOSI 4 Serial data in

RESET 5 Reset signal (active low)

GND 6 Ground

Table 2-3. Pack connector (TB3).

Name Description

P+ Pack positive terminal

INSYS Battery in system

P- Pack negative terminal

NOTE To turn on the charge and discharge MOSFET, INSYS-pin should be connected to P-.

Table 2-4. SMBus connector (J1).

Name Pin number Description

SDA 1 SMBus data port

SCL 2 SMBus clock port

NC 3-9 Reserved

GND 10 Ground

6 Atmel AVR365

8336A-AVR-03/12

3 Platform setup procedure

3.1 Install Battery Studio

Download and install Atmel AVR Battery Studio 2.0 from www.atmel.com/BM300.

3.2 Connection setup

1. Connect the battery cells to BM302 cell terminals

Connect the cells from the bottom of the stack to the top of the stack. For a 3S

application the following connection order must be used: Cell1- to 1- on BM302;

Cell1+ and Cell2- to 1+; Cell2+ and Cell3- to 2+; Cell3+ to 3+. For 3S- packs, 4+ on

BM302 should be connected to 3+.

CAUTION The battery cell terminals polarity and the mounting order must be respected

during assembly and disassembly. When assembling; mount Cell1, then

Cell2, and then Cell3. When disassembling; remove Cell3 first, then Cell2,

and then Cell1.

2. Connect BM300 to BM302 by the 10-pin cable

Figure 3-1. Connect BM300 to BM302.

3. Connect BM300 to PC USB port

The BM300 is powered by USB and the power status is indicated by a red LED near

the USB connector.

3.3 Start the Atmel ATBM302

The ATBM302 device remains in power-off mode although the battery cells have

been connected to the BM302. An external power-up trigger is necessary in order to

power up the ATBM302 device. To start the device a charging voltage must be

applied between pack+ and pack-.

After power-up, the device will perform initialization in the first 30s. During this time,

the reported current will not be correct.

Run the Battery Studio 2.0. Please refer to the Atmel AVR363 Application Note to

learn about how to use Battery Studio 2.

Atmel AVR365

8336A-AVR-03/12

4 Schematic and board layout

4.1 Schematic

This section shows the schematic for the Atmel ATBM302-EK.

Figure 4-1. ATBM302-EK schematic.

PACK-

VREG

PV2

PV1

CCADC_P

CCADC_N

VFET

Charge & Discharge MOSFETs

BATT

PVT

GND

PV3

PPI

NNI

GND

LED0

Secondary Protection

Status

LED1

LED2

LED3

LED4

ESD

GND

Sense_PI

Sense_NI

OCG

ODG

VREG

PACK-

Polarity safety MOSFET

VREG

RESET

SMB_CLOCK

SMB_DATA

Cell-

PV1R

PV2R

Cell+

WSK25125L000FEA

FUSE

PV3R

PV4 PACK+

PACK-

MM5Z18VT1G

FUSE

10k

R33

200kR22

VREG

BAT54XV2T1G

D12

1 2

3 4

5 6

7 8

910

HEADER 2x5

SMB_CLOCKSMB_DATA

header used for SMBus

1 3

SKRAALE010

SW1

10n

C20

2N7002

1kR2

1kR5

1kR4

1kR3

1kR11

1kR14

100RR19

100RR12

100RR13

100RR15

100RR16

100RR20

100RR21

10k

R30

10k

R29

10k

R28

10k

R27

22n

C18

C19

LED3

LED4

LED0

LED1

LED2

Fuse

Heater

SFH-1412A

1MR51

Si2307Q7

10kR52

100RR6

100RR7

100RR8

100RR9

100RR10

R18

R17

2.2u

C13

TB1

TB2

TB3

Q3 Si4168DY

Q2 Si4168DY

2 3

PMV31XN

R50 150R

Cut track beneath if mounted

1 2

103AT-4T1

1 2

103AT-4T0

200k

R23

100RR42

PACK-

GND

100nF

C10

100nF

C11

100nF

C12

100nF

C15

100nF

C17

100nFC14 100nFC16

100nF

C21

100nF

C22

CO 8

ICT 7

VSS

VC3

VC2

VC1

SENSE

2VCC 1

S-8244AAGFN-CEGT2G

C24

1uF

2.4k

R34

5.1kR39

5.1kR38

VREG

FUSE_STATUS

10kR24

OPC

FUSE_STATUS

SWITCH

AZ23C5V6-7F

GND

VREG

header used for ISP

GND

MISO

SCK

RESET

MOSI

1 2

3 4

5 6

HEADER 2x3

MISO

MOSI

SCK

OCG ODG

R35

21 D5

21 D6

21 D7

21 D8

21 D9

10nC26

GND

200R

R37

GND

VREG

GND

PV2

PV1

NNI

Vclmp10

OC 18

VFET 12

OD 16

BATT 13

RESET 19

NTC1 8

NTC0 7

VREF 4

VREFGND 3

VREG

VCC

NC2

NC3

GND

LED2 22

LED1 21

LED0 20

EXTPORT

LED3 23

PV4

PV3

FUSE 9

INSYS 26

NC 25

LED4 24

ALERT 28

30 FUSE_STATUS

31 SWITCH 10

SDA

32 SCL

33 OPC

PPI

PVT 37

VCC

ATBM302

2 1

MM5Z3V3T1G

200RR43

BAT54XV2T1G

D10

2 1

BAT54XV2T1G

D11

BAT54XV2T1G

10nC23

10nC25

4.2 Components placement

Figure 4-2. The top layer layout.

8 Atmel AVR365

8336A-AVR-03/12

Figure 4-3. The bottom layer layout.

4.3 Bill of materials (BOM)

This section shows the BOM for the Atmel ATBM302-EK.

Table 4-1. BOM.

Designator Description Quantity

C1, C2, C3, C4, C5, C6, C7, C8,

C9, C10, C11, C12, C14, C15, C16,

C17, C21, C22

100nF, ceramic capacitor, SMD 0603, X7R, 50V, 10% 18

C13 2.2µF, ceramic capacitor, SMD 0603, X5R, 10V, 10% 1

C18 22nF, ceramic capacitor, SMD 0603, X7R, 50V, 10% 1

C19 1µF, ceramic capacitor, SMD 0603, X5R, 6.3V, 10% 1

C20, C23, C25, C26 10nF, ceramic capacitor, SMD 0603, X7R, 50V, 10% 4

C24 1µF, ceramic capacitor, SMD 0603, X5R, 25V, 10% 1

D1 Dual zener diode, 5.6V, 300mW, SOT23-3 1

D2 Zener diode, SMD SOD-523, 3.3V, 0.2W 1

D3 Zener diode, SMD SOD-523, 18.0V, 0.2W 1

D4, D10, D11 Schottky diode, If:200mA, Vf:0.35V, Vrrm:30V, SOD-523 3

D5, D6, D7, D8, D9 LED, red, wave length = 639nm, SMD 0805 5

D12 Schottky diode, If:200mA, Vf:0.35V, Vrrm:30V, SOD-523 1

J1 2 × 5 pin header, 2.54mm pitch, Pin-in-Paste THM 1

J2 2 × 3 pin header, 2.54mm pitch, Pin-in-Paste THM 1

N-channel. MOSFET. 20V, 5.9A continuous, 23.7A peak.

RDS(ON) = 0.037@VGS = -4.5V,

RDS(ON) = 0.053@VGS = -2.5V, VGS(th)<1.5V, SOT-23

Q2, Q3 N-MOSFET, SO-8, continuous current 16A, Vds = 30V, Vgs = 20V 2

Q4 N-channel MOSFET. 60V, 0.115A continuous, 0.8A peak.

RDS(ON) = 7.5@VGS = 5.0V, VGS(th)<3V 1

P-channel MOSFET. -20V, -2.4A continuous, -10.0A peak.

RDS(ON) = 100m@VGS = -1.8V,

RDS(ON) = 70m@VGS = -2.5V, VGS(th)<1.5V

R1 5mcurrent sense resistor SMD WSK2512 4-terminal 1

R2, R3, R4, R5, R11, R14, R35 1kthick film resistor, SMD 0603, 1/10W, 1% 7

R6, R7, R8, R9, R10, R12, R13,

R15, R16, R19, R20, R21, R42 100thick film resistor, SMD 0603, 1/10W, 1% 13

Atmel AVR365

8336A-AVR-03/12

R17, R18, R51 1Mthick film resistor, SMD 0603, 1/10W, 1% 3

R22, R23 200kthick film resistor, SMD 0603, 1/10W, 1% 2

R24, R27, R28, R29, R30, R33,

R52 10kthick film resistor, SMD 0603, 1/10W, 1% 7

R34 2.4kthick film resistor, SMD 0603, 1/10W, 1% 1

R37, R43 200thick film resistor, SMD 0603, 1/10W, 1% 2

R38, R39 5.1kthick film resistor, SMD 0603, 1/10W, 1% 2

R50 150resistor, RC2512JK-7W150RL ,YAGEO 1

SW1 6.2mm × 6.2mm SMD tact switch 1

T0, T1 NTC, 103AT-4 2

TB1 Cable connector, 2-pin, through-hole 1

TB2, TB3 Cable connector, 3-pin, through-hole 2

U1 2nd protection IC for 1-4S, 8-leds, MSOP 1

U2 Pre-program ATBM302 1

10 Atmel AVR365

8336A-AVR-03/12

5 EVALUATION BOARD/KIT IMPORTANT NOTICE

This evaluation board/kit is intended for use for FURTHER ENGINEERING,

DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is

not a finished product and may not (yet) comply with some or any technical or legal

requirements that are applicable to finished products, including, without limitation,

directives regarding electromagnetic compatibility, recycling (WEEE), FCC, CE or UL

(except as may be otherwise noted on the board/kit). Atmel supplied this board/kit

“AS IS,” without any warranties, with all faults, at the buyer’s and further users’ sole

risk. The user assumes all responsibility and liability for proper and safe handling of

the goods. Further, the user indemnifies Atmel 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 and any other technical or legal concerns.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER

USER NOR ATMEL SHALL BE LIABLE TO EACH OTHER FOR ANY INDIRECT,

SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

No license is granted under any patent right or other intellectual property right of

Atmel covering or relating to any machine, process, or combination in which such

Atmel products or services might be or are used.

Mailing Address: Atmel Corporation, 2325 Orchard Parkway, San Jose, CA 95131

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