ATAVRSB100【PDF 14/20 页】SMART BATTERY DEVELOPMENT KIT

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interrupt service routine. This approach also allows the use of a single current-limiting

resistor, as only one LED is enabled at a time.

Table 2-8. JB1: LED enable jumper block

Pin

1

2

3

4

5

6

7

8

9

10

Name

LED1-K

PB4

LED2-K

PB5

LED3-K

PB7

LED4-K

PD0

LED5-K

PD1

Direction

Output

Output

Output

Output

Output

Usage

LED1 enable, active-low

LED2 enable, active-low

LED3 enable, active-low

LED4 enable, active-low

LED5 enable, active-low

JB2 provides access to several I/O signals as well as extra signals used in the

software implementation provided by Atmel (specifically the SMBCLK signal and the

SPARE pushbutton). Additionally, power for the LEDs can be selected here to come

either directly from 3.3V or from PB6 (OC0A PWM output).

Table 2-9. JB2: Miscellaneous signals jumper block

Pin

1

2

3

4

5

6

7

8

9

10

Name

GND

PA5

SMBCLK

PA6

SW1

PA7

LED_PWR

PB6

LED_PWR

+3.3V

Direction

I/O

I/O

Input

Output

Input

Output

Usage

Unused

Tied to PA6 for SMBus idle detection

Tied to SMBCLK for SMBus idle detection

Spare switch to activate Capacity Indicator LEDs

SW1 pushbutton input

Common positive feed to all LEDs

PWM to LEDs

Common positive feed to all LEDs

Steady supply to LEDs

2.7.3 External Thermistors

Using HDR1 (described in Table 2-10 below), SB100 provides control and

measurement for up to four external thermistors. PA0-3 are inputs to the VADC with a

range of 0 – 1.100V, while PA4 has a range of 0 – 5.500V. Thus, for best accuracy

and lowest power, one of the inputs PA0-3 should be used to read external

thermistors. Using the Vref output of 1.100V to power the thermistor circuitry ensures

that the maximum ADC range is available without concern for circuit tolerances, as

would be the case if 3.3V were used.

In practice, PA0 is shorted to the common bus - the odd-numbered pins of HDR1 -

while PA1-4 connect to individual thermistors. The other side of all thermistors ties to

the bus. The PAx VADC inputs have a relatively low input impedance of about 100K.

14

AVR454

2598C-AVR-06/06

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