ATA6612C View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
ATA6612C
Atmel Corporation
'ATA6612C' PDF : 312 Pages View PDF
5.8.4
External Reset
An external reset is generated by a low level on the RESET pin. Reset pulses longer than the minimum pulse width (see
Table 5-20 on page 62) will generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate
a reset. When the applied signal reaches the reset threshold voltage – VRST – on its positive edge, the delay counter starts
the MCU after the Time-out period – tTOUT – has expired. The external reset can be disabled by the RSTDISBL fuse, see
Table 5-118 on page 255.
Figure 5-18. External Reset During Operation
VCC
RESET
TIME-OUT
VRST
tTOUT
INTERNAL
RESET
5.8.5
Brown-out Detection
Atmel® ATA6612C/ATA6613C has an on-chip brown-out detection (BOD) circuit for monitoring the VCC level during
operation by comparing it to a fixed trigger level. The trigger level for the BOD can be selected by the BODLEVEL fuses. The
trigger level has a hysteresis to ensure spike free brown-out detection. The hysteresis on the detection level should be
interpreted as VBOT+ = VBOT + VHYST/2 and VBOT– = VBOT – VHYST/2.
Table 5-21. BODLEVEL Fuse Coding(1)
Note:
BODLEVEL 2..0 Fuses
111
Min VBOT
Typ VBOT
Max VBOT
BOD disabled
Units
110
1.8
101
2.7
V
100
4.3
011
010
Reserved
001
000
1. VBOT may be below nominal minimum operating voltage for some devices. For devices where this is the case,
the device is tested down to VCC = VBOT during the production test. This guarantees that a brown-out reset will
occur before VCC drops to a voltage where correct operation of the microcontroller is no longer guaranteed.
The test is performed using BODLEVEL = 110 and BODLEVEL = 101 for Atmel ATA6612CV/ATA6613CV, and
BODLEVEL = 101 and BODLEVEL = 101 for ATA6612C/ATA6613C.
ATA6612C/ATA6613C [DATASHEET]
63
9111L–AUTO–11/14
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