mc68hc908rc24d Freescale Semiconductor, Inc, mc68hc908rc24d Datasheet - Page 200

• Manufacturer Part Number: mc68hc908rc24d
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Preliminary Electrical Specifications
19.11 Battery Detection Characteristics
19.12 Battery Circuit Component Specifications
Advance Information
200
Battery insertion rearm voltage
BATT to V
BATT to V
Supply rise time ramp rate
External V
External V
External BATT capacitor
External BATT resistor
1. When supply is removed from the BATT pin, the pin voltage must fall below V
2. If minimum BATT pin voltage is not reached before the internal POR reset is released, RST must be driven low externally
1. Capacitor is electrolytic, ± 20%, ESR < 4 Ω
2. Capacitor is ceramic, ± 20%
that battery reinsertion is detected.
until minimum BATT voltage is reached.
DD
DD
DD
DD
voltage @ BATT = 2.1 V
voltage @ BATT = 3.3 V
supply capacitor
bypass capacitor
Characteristic
Characteristic
2
(2)
(1)
(2)
(1)
Preliminary Electrical Specifications
Symbol
Symbol
C
C
C
R
R
VBULK
V
VBYP
BATT
BATT
V
V
POR
BR
F
F
0.1 ± 20%
0.1 ± 20%
1 ± 5%
BR
0.035
Min
Typ
—
—
—
—
before supply is reapplied to guarantee
MC68HC908RC24 — Rev. 1.1
470 ± 20%
Freescale Semiconductor
Max
Max
100
200
300
—
—
—
—
V/ms
Unit
Unit
MΩ
mV
mV
mV
µF
µF
µF