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| SAA1501T Datasheet, PDF (13/20 Pages) NXP Semiconductors – Battery charge level indicator | |||
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Philips Semiconductors
Battery charge level indicator
Objective speciï¬cation
SAA1501T
SYMBOL
PARAMETER
CONDITIONS
MIN.
I/F converter
a
multiplication factor for
Iref1
Vclamp
clamping voltage (pin 4)
VCCC(H)
VCCC(L)
HIGH level reference
voltage (pin 4)
LOW level reference
voltage (pin 4)
Iref1 = a à Iref
(where a is constant);
V4 = 1.26 V; idle mode
Ic = 0; Id = 60 µA;
I4 = 10 µA
2.35
0.7
1.58
1.26
Pulse width modulator
ACC
Imax
Id/Imax
accuracy for Imax at Ccy
maximum DC current
k factor
VCCY
VCCY
start up-clamping voltage
(pin 3)
clamping voltage (pin 3)
VCCY(H)
HIGH level switching
voltage
VCCY(L)
LOW level switching
voltage
IZ
3-state enable current
Mode detector
Iref2
mode detection level at
pins 7 and 8
Iref4
mode detection level at
pin 7
15 < Imax < 60 µA
Imax = Vmax/Rmax; note 1
k = 1; Vd = 1.5 V; idle mode
k = 0.1; Vd = 1.5 V; idle
mode
k = 0.025; Vd = 1.5 V;
idle mode
Id = 10 µA; Ic = 0
â
0.6
0.95
0.094
0.023
0.7
open-circuit at pin 3;
pin 5 = VCC;
±(Ic â Id) = 60 µA
â
1.60
1.28
V2 = 1.5 V
â
Iref2 ⥠e à Iref
â
(where e is constant)
Iref4 ⥠Iref2;
â
in modes POLD and BATLD
Oscillator (pin 13)
Qc
charge amount
Qd
discharge amount
âQ
difference between
charge and discharge
charge amount
b
âVosc
multiplication factor for
Iref3
voltage swing
HIGH-to-LOW transition
Iref1(sink) Ã Tclk
Iref1(source) Ã Tclk
Iref3 = b à Iref
(where b is constant)
142
142
0.95
â
â
TYP.
2.5
0.9
1.66
1.33
â
â
0.98
0.099
0.025
0.9
â
1.77
1.32
â
0.15Iref
25Iref2
150
150
1.0
0.75
440
MAX.
UNIT
2.65
1.1
V
1.74
V
1.4
V
±3
%
60
mA
1.01
0.104
0.027
1.1
V
VCC â 0.6 V
1.86
V
1.37
V
1
µA
â
â
158
nC
158
nC
1.05
â
â
mV
December 1994
13
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