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PDF DS1259 Data sheet ( Hoja de datos )
| Número de pieza | DS1259 | |
| Descripción | Battery Manager Chip | |
| Fabricantes | Dallas Semiconducotr | |
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DS1259
Battery Manager Chip
FEATURES
Facilitates uninterruptible power
Uses battery only when primary VCC is not
available
Low forward voltage drop
Power fail signal interrupts processor or write
protects memory
Consumes less than 100 nA of battery current
Low battery warning signal
Battery can be electrically disconnected upon
command
Battery will automatically reconnect when
VCC is applied
Mates directly with DS1212 Nonvolatile
Controller x 16 Chip to back up 16 RAMs
Optional 16-pin SOIC surface-mount package
PIN ASSIGNMENT
NC
VBAT
1
2
16 VCCI
15 VCCI
BF 3
NC 4
14 NC
13 VCCO
BAT 5
12 VCCO
RST 6
11 PF
GND 7
10 NC
GND 8
9 NC
16-Pin DIP Package (300-mil)
See Mech. Drawings Section
PIN DESCRIPTION
NC - No Connect
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NC
VBAT
1
2
16 VCCI
15 VCCI
VBAT
- Battery Input Connection
BF 3
14 NC
BF - Battery Fail
NC 4
13 VCCO
Output Signal
BAT 5
12 VCCO
BAT
- Battery Output
RST 6
11 PF
RST
GND
- Reset Input
- Ground
GND
GND
7
8
10 NC
9 NC
PF - Power Fail
Output Signal
16-Pin SOIC Package (300-mil)
See Mech. Drawings Section
VCCO
- RAM Supply
VCCI
- +5V Supply
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DESCRIPTION
The DS1259 Battery Manager Chip is a low-cost battery management system for portable and nonvolatile
electronic equipment. A battery connected to the battery input pin supplies power to CMOS electronic
circuits when primary power is lost through an efficient switch via the VCCO pins. When power is supplied
from the battery, the power-fail signal is active to warn electronic reset circuits of the power status.
Energy loss during shipping and handling is avoided by pulsing reset, thereby causing the battery to be
isolated from other elements in the circuits.
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POWER-DOWN/POWER-UP CONDITION
DS1259
NOTES:
1. All voltages are referenced to ground.
2. Load capacity is 50 pF.
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3. Measured with Pins 11, 12, 13, and 3 open.
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4. VTP is the point that PF is driven low.
5. ICCO2 may be limited by the capability of the battery.
6. Trip point voltage for power-fail detect:
VTP = 1.26 x VBAT ± 250 mV
For 5% operation: VBAT = 3.7V max.
For 10% operation: VBAT = 3.5V max.
7. VBATF is the point that BF is driven low. These limits are for 0°C to 70°C operation.
8. Battery leakage is the internal energy consumed by the DS1259.
9. VCC = +5 volts, tA = 25°C.
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| PDF Descargar | [ Datasheet DS1259.PDF ] | |
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