ATmega16HVB datasheet(142/273 Pages) ATMEL

142 / 273 page

142

8042A–AVR–07/09

ATmega16HVB/32HVB

24.7.3

BPSCTR – Battery Protection Short-current Timing Register

• Bit 7 – Res: Reserved Bits

This bit is reserved in the ATmega16HVB/32HVB and will always read as zero.

• Bit 6:0 – SCPT6:0: Short-current Protection Timing

These bits control the delay of the Short-circuit Protection. The Short-circuit Timing can be set

with a step size of 62.5 µs as shown in Table 24-2 on page 142.

Notes:

1. The actual value depends on the actual frequency of the ”Ultra Low Power RC Oscillator” on

page 27. See ”Electrical Characteristics” on page 228.

2. Initial value: SCPT[0x10](1ms).

3. An additional delay T

d can be expected after enabling the Discharge FET due to initialization of

the protection circuit. With nomial ULP frequency this delay is maximum 86 µs.

Note:

Due to synchronization of parameters between clock domains, a guard time of 3 ULP oscillator

cycles + 3 CPU clock cycles is required between each time the BPSCTR register is written. Any

writing to the BPSCTR register during this period will be ignored.

24.7.4

BPOCTR – Battery Protection Over-current Timing Register

• Bit 7:6 – Res: Reserved Bits

These bits are reserved in the ATmega16HVB/32HVB and will always read as zero.

• Bit 5:0 – OCPT5:0: Over-current Protection Timing

These bits control the delay of the Over-circuit Protection. The Over-current Timing can be set

with a step size of 0.5 ms as shown in Table 24-3 on page 143.

Bit

765

432

(0xFA)

–

SCPT[6:0]

BPSCTR

Read/Write

R/W

Initial Value

Table 24-2.

Short-circuit Protection Reaction Time. SCPT[6:0] with corresponding Short-cir-

cuit Delay Time.

Short-circuit Protection Reaction Time(1)

SCPT[6:0](2)

Typ

0x00

(15.5 - 70.5 µs) + Td

(3)

0x01

(15.5 - 70.5 µs) + Td

(3)

0x02

(78.0 - 133.0 µs) + T

(3)

0x03

(140.5 - 195.5 µs) + Td

(3)

...

0x7E

(7.83 - 7.88 ms) + T

(3)

0x7F

(7.89 - 7.95 ms) + Td

(3)

Bit

765

4321

(0xFB)

–

OCPT[5:0]

BPOCTR

Read/Write

R/W

Initial Value

000

0001

ATmega16HVB 数据表(PDF) 142 Page - ATMEL Corporation

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