34.5 System and Reset Characteristics

Table 34-7. Reset, Brown-out and Internal Voltage Characteristics(1)
SymbolParameterConditionMin.TypMaxUnits
VPOTPower-on Reset Threshold Voltage (rising)1.11.51.7V
Power-on Reset Threshold Voltage (falling)(2)0.61.01.7V
SRONPower-on Slope Rate0.01-9V/ms
VRST RESET Pin Threshold Voltage0.2 VCC-0.9 VCCV
tRSTMinimum pulse width on RESET Pin--2.5μs
VHYSTBrown-out Detector Hysteresis-50-mV
tBODMin. Pulse Width on Brown-out Reset-2-μs
VBGBandgap reference voltage1.01.11.2V
tBGBandgap reference start-up timeVCC=2.7
TA=25°C-4070μs
IBGBandgap reference current consumptionVCC=2.7
TA=25°C-10-μA
Note:
  1. Values are guidelines only.
  2. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)
Table 34-8. BODLEVEL Fuse Coding(1)(2)
BODLEVEL [2:0] Fuses Min. VBOT Typ. VBOT Max VBOT Units
111 BOD Disabled
110 1.7 1.8 2.0 V
101 2.5 2.7 2.9
100 4.1 4.3 4.5
011 - 000 Reserved
Note: 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, 101 and 100.
Note: VBOT tested at 25°C and 85°C in production