ds2740 Maxim Integrated Products, Inc., ds2740 Datasheet - Page 4

• Manufacturer Part Number: ds2740
• Description: Ds2740 High-precision Coulomb Counter
• Manufacturer: Maxim Integrated Products, Inc.

Table 2. DETAILED PIN DESCRIPTIONS
Figure 2. APPLICATION EXAMPLE
OVD
SNS
PIN
V
PIO
IS2
IS1
V
DQ
DD
SS
SYMBOL
1
2
3
4
5
6
7
8
DATA
PIO
GND
System
2.7V to 5.5V
System Supply
Battery Pack
1-Wire Bus Speed Control. Input logic level selects the speed of the 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.
Programmable I/O Pin. Programmed as input or output through internal
registers. Open-drain output sufficient for LED or vibrator activation.
Current-Sense Resistor Input
Current-Sense Input. Connected to SNS through a 10kΩ resistor to
allow filtering of the current waveform by an external capacitor.
Current-Sense Input. Connected to V
filtering of the current waveform through an external capacitor.
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.
Internal 1µA pulldown aids in sensing pack removal and Sleep-mode
activation.
Power-Supply Input. Connects to system voltage supply or positive
terminal of battery cell.
* 5.6V zener recommended for ESD protection when DATA or PIO
contacts exposed, such as a removable battery pack application
150
330
*
Positive
*
or
DQ
PIO
SNS
IS2
4 of 16
DS2740
R
SNS
DESCRIPTION
104
OVD
VDD
VSS
IS1
SS
through a 10kΩ resistor to allow
150
Connection
To
Battery
Negative
104