34.5 System and Reset Characteristics
Symbol | Parameter | Condition | Min. | Typ | Max | Units |
---|---|---|---|---|---|---|
VPOT | Power-on Reset Threshold Voltage (rising) | 1.1 | 1.5 | 1.7 | V | |
Power-on Reset Threshold Voltage (falling)(2) | 0.6 | 1.0 | 1.7 | V | ||
SRON | Power-on Slope Rate | 0.01 | - | 9 | V/ms | |
VRST | RESET Pin Threshold Voltage | 0.2 VCC | - | 0.9 VCC | V | |
tRST | Minimum pulse width on RESET Pin | - | - | 2.5 | μs | |
VHYST | Brown-out Detector Hysteresis | - | 50 | - | mV | |
tBOD | Min. Pulse Width on Brown-out Reset | - | 2 | - | μs | |
VBG | Bandgap reference voltage | 1.0 | 1.1 | 1.2 | V | |
tBG | Bandgap reference start-up time | VCC=2.7 TA=25°C | - | 40 | 70 | μs |
IBG | Bandgap reference current consumption | VCC=2.7 TA=25°C | - | 10 | - | μA |
Note:
- Values are guidelines only.
- The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)
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