DS2740 Просмотр технического описания (PDF) - Maxim Integrated
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DS2740 Datasheet PDF : 16 Pages
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Table 2. DETAILED PIN DESCRIPTIONS
DS2740
PIN SYMBOL
DESCRIPTION
OVD
1-Wire Bus Speed Control. Input logic level selects the speed of the 1-
1
Wire bus. Logic 1 selects overdrive (OVD) and Logic 0 selects standard
timing (STD). On a multidrop bus, all devices must operate at same
speed.
PIO
2
Programmable I/O Pin. Programmed as input or output through internal
registers. Open-drain output sufficient for LED or vibrator activation.
SNS
3
Current-Sense Resistor Input
IS2
4
Current-Sense Input. Connected to SNS through a 10kΩ resistor to
allow filtering of the current waveform by an external capacitor.
IS1
5
Current-Sense Input. Connected to VSS through a 10kΩ resistor to allow
filtering of the current waveform through an external capacitor.
VSS
6
Device Ground, Current-Sense Resistor Return. Connect directly to
the negative terminal of the battery cell.
Data I/O Pin. Operates bidirectionally with open-drain output driver.
DQ
7
Internal 1µA pulldown aids in sensing pack removal and Sleep-mode
activation.
VDD
8
Power-Supply Input. Connects to system voltage supply or positive
terminal of battery cell.
Figure 2. APPLICATION EXAMPLE
2.7V to 5.5V
System Supply or
Battery Pack Positive
150
DATA 150
PIO 330
VDD
DQ
104
DS2740
PIO
OVD
**
SNS
IS2
System
GND
VSS
IS1
104
Connection
To
Battery
Negative
RSNS
* 5.6V zener recommended for ESD protection when DATA or PIO
contacts exposed, such as a removable battery pack application
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