CXB1582Q
4. Power-on reset signal (POR∗)
The CXB1582Q has a power-on reset signal output (POR∗). As shown in figure (a) below, this signal is output
at low level for approximately 100ns after the power is turned on, after which it goes to high level and can be
used as the system reset signal. The low level time Tpor can be adjusted by capacitance Crt connected to the
RTCAP pin as shown in figure (b) below. Tpor conforms roughly to the following equation.
Tpor = 90ns × (1 + Crt/10pf)
POR∗ 71
POR∗ Output
Tpor
Power ON
(a)
RTCAP 70
Crt
(b)
Fig. 4. Power-on Reset Signal Setting
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