NRF51802-QFAA-R datasheet(41/85 Pages) NORDIC

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Page 41

nRF51802 Product Specification v1.2

Power on reset time (tPOR) is the time from when the supply starts rising to when the device comes out of

reset and the CPU starts. The time increases with, and is inclusive of, supply rise time from 0 V to VDD.

Table 28 gives tPOR for a number of supply rise times, simulated with a linear ramp from 0 V to VDD, over the

supply voltage range 1.8 V to 3.6 V.

Table 28 Power on reset time

The data in Figure 9 and Table 29 show measured t_POR data. Measurements were taken using the reference

circuit shown in Section 11.3.1 “QFAA QFN48 schematic with internal LDO setup” on page 73 with the given

supply voltage and temperature conditions.

Figure 9 Power on reset time (Test level 2)

Table 29 Supply rise time at sample voltages for the measured data shown in Figure 9.

Symbol

Description

Note

Min.

Typ.

Max.

Units

Test

level

tPOR, 10 μs

Power on reset time, 10 μs rise

time (0 V to VDD).

0.6

3.2

tPOR, 1 ms

Power on reset time, 1 ms rise

time (0 V to VDD).

1.5

4.1

tPOR, 10 ms

Power on reset time, 10 ms rise

time (0 V to VDD).

tPOR, 50 ms

Power on reset time, 50 ms rise

time (0 V to VDD).

VDD

Rise Time from 10% to 90% of VDD

1.8

570 μs

3.0

605 μs

3.6

635 μs

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