35.11 RSTCTRL and BOD

Table 35-15. Reset, WDT, Oscillator Start-up Timer, Power-up Timer, Brown-out Detector Specifications
Symbol Description Min. Typ. ✝ Max. Unit Conditions
tRST * RESET pin pulse-width low to ensure a Reset 2.5 μs
RRST_UP * RESET pin pull-up resistor 35
TOST * Oscillator start-up timer period(1) 1024 cycles
VBOD+ Brown-out Detect Voltage, rising slope(2)

1.75

1.90

2.60

4.30

1.80

2.00

2.73

4.52

V

V

V

V

BODLEVEL0

BODLEVEL1

BODLEVEL2

BODLEVEL3

VBOD- Brown-out Detect Voltage, falling slope(2)

1.70

1.80

2.47

4.08

1.75

1.90

2.60

4.30

V

V

V

V

BODLEVEL0

BODLEVEL1

BODLEVEL2

BODLEVEL3

VBOD_HYS Brown-out Detect hysteresis 25 mV
tBOD_ST Brown-out Detect start-up time from sleep 30 μs
tBOD BOD sampling time when used in Sampling mode 1/fBOD ms
tBOD_RST Brown-out Reset response time 4 μs VDD = VBOD - 0.1V

Data in the “Typ.” column is at TA = 25°C and VDD = 3.0V unless otherwise specified. These parameters are not tested and are for design guidance only.

* These parameters are characterized but not tested in production.

Note:
  1. By design, the Oscillator Start-up Timer (TOST) counts the first 1024 cycles, independent of frequency.
  2. VDD and GND must be capacitively decoupled as close to the device as possible to ensure these voltage tolerances. Recommended values are 0.1 μF and 0.01 μF in parallel.
Table 35-16. Voltage Level Monitor Threshold Specifications
Symbol Description Min. Typ. ✝ Max. Unit Conditions
VDET * Voltage detection threshold 5 % above BOD threshold VLMLVL = 0x01
15 VLMLVL = 0x02
25 VLMLVL = 0x03

Data in the “Typ.” column is at TA = 25°C and VDD = 3.0V unless otherwise specified. These parameters are not tested and are for design guidance only.

* These parameters are characterized but not tested in production.