EM6605 EM Microelectronic, EM6605 Datasheet - Page 31

• Manufacturer Part Number: EM6605
• Description: 4 bit Microcontroller
• Manufacturer: EM Microelectronic

16. Measured Electrical Behaviors
16.1. IDD Current
Specially the Stand-By current (IVDDh) depends on the current mirror ratio between the current which goes
through an external resistor (IRext) and the current which is used in the internal RC oscillator capacitor (IRCint).
Like that we can reduce the power consumption in StandBy mode. This current is approximately equal to:
IR ext ~ 0.2V / Rext
[uA ]
19.0
18.0
17.0
16.0
[nA ]
350
330
310
290
[uA ]
8.0
7.0
6.0
5.0
28
24
20
16
12
8
4
-40
-40
-40
0
[uA ]
I(V DDa) A c tive, V DD=3.0/5.0V ,R=330k Ohm
I(V DDh) A c tive, V DD=3.0V ,R= 120k Ohm
-20
-20
-20
50
I(V DDs) S leep m ode, V DD=3V /5V
I(V DDa) A ctive = f(freq), V DD=3V
0
0
100
0
The internal Oscillator capacitor is charged with 1/5,1/4,1/3, or 1/2 of this current.
All data here are with ratio IRCint / IRext = 1/5.
20
20
20
150
40
40
40
200
60
60
60
250
[°C]
[°C]
[°C]
[k Hz ]
80
80
80
300
5V
5V
3V
3V
5V
3V
C urrent ratio
I (RC int) / I (Re xt)
X = 1 /5
X = 1 /4
X = 1 /3
X = 1 /2
[uA ]
2.8
2.6
2.4
2.2
[uA ]
4.4
4.2
3.8
[uA ]
6
5
4
3
2
1
0
2
4
0
-40
-40
I(V DDh) S tandB y, V DD =3.0/5.0V ,Rex t=120kOhm
I(V DDh) S tandB y , V DD = 3.0/5.0V ,Rext=330k Ohm
-20
50
-20
I(V DDh) S tandB y = f(freq), V DD=3V
100
IVDDa[µA] ~ IVDDh + f[kHz]*0.067
0
0
f = f0
f = f0 * 1.25
f = f0 * 1.67
f = f0 * 2.50
fre quency
20
20
© EM Microelectonic-Marin SA, 2/99, Rev. B/243
150
40
40
200
I(Rext)
EM6605
60
60
250
[°C]
[°C]
@ X=1/5
[k Hz ]
80
80
300
5V
5V
3V
3V
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