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PDF DS2714 Data sheet ( Hoja de datos )

Número de pieza DS2714
Descripción Quad Loose Cell NiMH Charger
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! DS2714 Hoja de datos, Descripción, Manual

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GENERAL DESCRIPTION
The DS2714 is ideal for standalone charging of 1 to 4
AA or AAA NiMH “loose” cells. NiCd cells can also be
charged. Temperature, voltage and charge time are
monitored to provide proper fast charging control
algorithms for Nickel Metal Hydride (NiMH) batteries.
Battery tests are included to detect defective or
inappropriate cells such as Alkaline primary batteries.
The DS2714 supports a parallel charging topology,
with independent monitoring and control of each cell.
APPLICATIONS
Desktop/Standalone Chargers (AAA/AA)
Digital Still Cameras
Music Players
Games
Toys
CHARGE TOPOLOGY
Controlled
Current
Source
4-Cell NiMH Charger
DS2714
GND
DS2714
Quad Loose Cell NiMH Charger
FEATURES
§ Charges 1 to 4 NiMH Cells
§ Detects and Avoids Charging Alkaline Cells
§ Pre-Charges Deeply Depleted Cells
§ Fast Charges NiMH with -DV Termination
Sensitivity of 2mV (typ)
§ Monitors Voltage, Temperature and Time for
Safety and Secondary Termination
§ Works with Regulated Charge Current Source
§ Drives PNP Type Pass Element
§ Compatible with Integrated Primary-Side PWM
Controllers
§ 20-pin TSSOP Package
ORDERING INFORMATION
PART
MARKING
PIN-PACKAGE
DS2714E+
DS2714 20 TSSOP
DS2714E+T&R DS2714 20 TSSOP Tape-and-Reel
+ Denotes lead-free package.
PIN CONFIGURATION
CC1
CC2
CC3
CC4
LED1
LED2
VSS
LED3
LED4
DMSEL
1
2
3
4
5
6
7
8
9
10
20 THM2
19 THM1
18 VP4
17 VP3
16 VP2
15 VP1
14 VSS
13 VDD
12 TMR
11 CTST
TSSOP
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through vario
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REV: 080206

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DS2714 pdf
Figure 1. Block Diagram
VDD BIAS
Oscillator
CC1
CC2
CC3
CC4
LED1
LED2
LED3
LED4
DMSEL
CTST
TMR
State Machine
Presence Test
Pre-Charge
Fast Charge
&
Cell Tests
Z-test
Scaler
Charge
Timer
0.1uA
Top-Off Charge
Maintenance Charge
SUSPEND
DS2714: Quad Loose Cell NiMH Charger
Voltage
and
Temperature
Measurement
VP1-VP4
THM 1
THM 2
VSS
VSS
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DS2714 arduino
DS2714: Quad Loose Cell NiMH Charger
EXAMPLE TIMING DIAGRAM FOR THE DS2714
N
N +1
N +2
N +3
N +4
N +5
N +6
N +7
N +8
N +9
N +10 N +11
123412341234123412341234123412341234123412341234123
Cell 1
Cell 2
Cell 3
Cell 4
NOTE 2
NOTE 1
Note 1: Cell test time slot for Cell 2.
Note 2: Cell test time slot for Cell 3.
In this timing diagram, the pulses represent charge current into the individual cells. Cell 1 is in Precharge (the timing of Precharge is the same as Top-off). It
gets one charge pulse out of every four available times slots.
Cell 2 is in initially in Fast Charge and it transitions to Topoff charge during the N+7th time interval (Note 1)shown in the diagram.
Cell 3 is in Fast charge. Cell testing is performed during the interval marked Note 2. This cell is not ready to go into Top-off and it resumes Fast charge.
Cell 4 is in maintenance mode, one out of every 32 available time slots gets a charge pulse.
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