HA16129FPJ Datasheet, PDF (8/23 Pages) Hitachi Semiconductor – Single Watchdog Timer

HA16129FPJ
Calculation Formulas (cont.)
Item
V_STBY
Formula
( ^67.6
V_STBY = 1.48 ×
+1
29.5 + 36.2 // R1
Notes
The voltage at which the STBY signal is output when Vout
falls. The STBY detection voltage can be adjusted by
connecting a resistor between the STBYadj pin and ground
(R3). However, the STBY recovery voltage cannot be
adjusted.
Vout
STBYadj
Vout ^VSTBY
STBY
V_STBY'
R1
STBY
V_NMI
(Vout detection)
( ^VNMI ^{= 1.2 ×}
1 + ^{R1 // 73}
R2 // 25
R1, R2; kΩ
t
The voltage at which the NMI signal is output when Vout
falls. (When NMIsns is connected to Vout.)
The NMI detection voltage can be adjusted by connecting
resistors between the NMIadj pin and Vout (R1), and
between the NMIadj pin and ground (R2).
Vout
NMIsns
NMI
Vout
V_NMI
V_NMI'
R2
NMIadj
R1
NMI
V_NMI
(V_CC detection)
( ^VNMI ^{= 4.62 ×}
R1 _{+ 1}
R2 // 97.1
Recovery voltage
( ^VNMI ^{= 4.68 ×}
R1 _{+ 1}
R2 // 45.5
R1, R2; kΩ
GND
t
The voltage at which the NMI signal is output when V_CC
falls. (When NMIsns is connected to V_CC.)
The NMI detection voltage can be adjusted by connecting
resistors between the NMIsns pin and V_CC (R1), and
between the NMIsns pin and ground (R2).
R1
NMIsns
V_CC CS
R2
Vout
NMI ^VCC
V_NMI
NMI
V_NMI'
OUTE
C_R × R_R > 19.3 × Cf × Rf
GND
t
If the OUTE function is used, the relationship shown at the
left must be fulfilled to assure that pulses are not incorrectly
generated in this output when a microprocessor runaway
state is detected.
Rev.3.00 Jun 15, 2005 page 8 of 22