EM6607 EM Microelectronic, EM6607 Datasheet - Page 25

• Manufacturer Part Number: EM6607
• Description: Ultra-low power microcontroller
• Manufacturer: EM Microelectronic

11 Supply Voltage Level Detector (SVLD)
The EM6607 has a software configurable Supply Voltage Level detector. Three levels can be defined within the power
supply range. During SLEEP mode this function is disabled.
Voltage level detector can be used also for Power-Check on Start-up of the EM6607 micro-controller when V
(see Chapter
The required voltage compare level is selected by writing the bits VLC1 and VLC2 in the SVLD control register that also
activates the compare measurement. Since the measurement is not immediate the busy flag remains high during the
measurement and is automatically cleared low when the measurement is finished. Reading the VLDR flag indicates the
result. If the result is 0 then the voltage level is higher than the selected compare level. And if 1 it is lower than the compare
level. The result VLDR of the last measurement remains until the new one is finished. The new result overwrites the
previous one.
During the SVLD operation power consumption increases by approximately 3μA for 3.9msec. The measurement internally
starts with the rising 256Hz edge following the SVLD test command. The additional SVLD consumption stops after the
falling edge of the 256Hz internal clock.
Table below lists the voltage level selection
Table 38.
V
Table 39.
Copyright © 2005, EM Microelectronic-Marin SA
Bit
3
2
1
0
Voltage level
SVLD disabled
V
V
V
L1
L1
L2
L3
level is also the level used for Power check if activated (table
SVLD Level selection
SVLD control register - SVLD
R
4 .7
1 3 5 H
Name
VLDR
busy
VLC1
VLC0
VLC1
0
0
1
1
P OR with Power-Check Reset
1 3 6 H
VLC0
0
1
0
1
Possible levels implementations
V
V
V
L1 :
L2 :
L3 :
Reset
0
0
0
0
possible levels are 2.3V ; 2.6V to 3.5V by step of 100mV ; 3.7V and 4V
possible levels are 2.6V to 3.5V by step of 100mV ; 3.7V and 4V
possible levels are from 1.3V to 3V by step of 100mV.
).
R/W
R
R
R/W
R/W
1 5.1.1).
1 3 7 H
Description
SVLD result (0=higher 1=lower)
measurement in progress
SVLD level control 1
SVLD level control 0
25
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EM6607
DD
is applied