ST92E163-EPB/US STMicroelectronics, ST92E163-EPB/US Datasheet - Page 89

• Manufacturer Part Number: ST92E163-EPB/US
• Description: KIT DEMO MASS STORAGE
• Manufacturer: STMicroelectronics
• Type: Microcontroller Programmerr

Specifications of ST92E163-EPB/US

• Contents: Programmer, Cable, Power Supply, Software, Manual and more
• For Use With/related Products: ST9 MCUs
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LOW VOLTAGE DETECTOR (LVD) RESET (Cont’d)
Figure 49
On Reset circuit for power supplies with very slow
power on ramp.
Figure 49. Suggested External POR Circuit for applications with very slow V
Figure 50. External Connection for RESET pin for applications with fast V
V
DD
R1
R2
gives an example of an external Power
T1
C1
ST92163R4 - RESET AND CLOCK CONTROL UNIT (RCCU)
V
DD
10kΩ
1µF
RESET
ST92163
RESET
This circuitry is composed of 1 PNP transistor, 2
resistors and 1 capacitor. It is thus cheaper than
an integrated P.O.R.
For more details, refer to Application note AN1366
ST92163
R1 = 270 Kohms, +/- 2 %
R1 = 1 Mohms, +/- 2 %
C1 = 1 µF, accuracy not important
T1 = BC857, PNP transistor with:
h
V
fe
eb
gain about 100
= 0.55 v , min = 0.5 v, max = 0.6 v
DD
DD
ramp up
ramp up
89/230