SAA1501T Datasheet, PDF (2/20 Pages) NXP Semiconductors – Battery charge level indicator

Philips Semiconductors
Battery charge level indicator
Objective specification
SAA1501T
FEATURES
• High level of integration to allow assembly in intelligent
battery packs
• Accurate charge and discharge account
• Large dynamic range of charge and discharge currents
• Independent settings of charge and discharge efficiency
• 2 V minimum supply voltage (2 cell operation)
• Temperature protection of batteries during charging
• Temperature controlled self-discharge
• Accurate charge current regulation
• Two charge amount display modes, LCD and LED.
GENERAL DESCRIPTION
The SAA1501T is intended to be used as a battery monitor
and charge current control circuit in rechargeable battery
systems.
The SAA1501T is processed in BiCMOS technology
where the benefits of mixed bipolar and CMOS technology
is fully utilized to achieve high accuracy measurements
and digital signal processing in the same device. The
general function of the integrated circuit is a Coulomb
counter. During battery charging, the charge current and
charge time are registered in a Coulomb counter. During
discharge, the discharge current and time are recorded.
The momentary charge amount of the batteries can be
displayed either on an LCD screen or on an LED bargraph.
Using the SAA1501T, intelligent batteries or intelligent
battery powered systems can be easily designed with only
a few external components.
QUICK REFERENCE DATA
SYMBOL
V_CC
I_CC
I_CCstb
f_osc
V_i(s)
T_amb
PARAMETER
CONDITIONS
supply voltage
supply current
V_CC = 3 V;
I_c = I_d = 60 µA
supply current in standby mode
V_CC = 3 V;
V_CSI = V_DSI = 0 V
fixed oscillator frequency
C_osc = 820 pF;
R_ref = 51.5 kΩ
input sense voltage (pins 9 and 10)
operating ambient temperature
MIN.
2.0
−
TYP.
3.0
1.2
MAX.
4.3
1.7
UNIT
V
mA
−
−
100
µA
−
4.2
−
kHz
0
−
0
−
V_CC − 1.6 V
+70
°C
ORDERING INFORMATION
TYPE NUMBER
SAA1501T
NAME
SO24
PACKAGE
DESCRIPTION
plastic small outline package; 24 leads; body width 7.5 mm
VERSION
SOT137-1
December 1994
2