6006B2 View Datasheet(PDF) - EM Microelectronic - MARIN SA
Part Name
Description
Manufacturer
6006B2 Datasheet PDF : 8 Pages
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R
H6006
Pin Description
Pin Name Function
1
VIN Voltage monitoring input
2
TCL Timer clear input signal
3
RC RC oscillator tuning input
4
VSS GND terminal
5
RES Reset output
6 SAVE Save output
7
TO Timer output signal
8
VDD Positive supply voltage terminal
Functional Description
Table 6
Supply Lines
The circuit is powered through the VDD and VSS pins. It
monitors both its own VDD supply and a voltage applied to the
VIN input.
VDD Monitoring
During power-up the VIN monitoring is disabled and RES and
SAVE stay active low as long as VDD is below VON (3.5 V). As
soon as VDD reaches the VON level, the state of the outputs
depend on the watchdog timer and the volt-age at VIN relative
to the thresholds (see Fig. 3 and 4). If the supply voltage VDD
falls back below VOFF (1.5 V) the watchdog timer and the VIN
monitoring are disabled and the outputs SAVE and RES are
active low. The VDD line should be free of spikes.
VIN Monitoring
The analog voltage comparators compare the voltage applied
to VIN (typically connected to the input of the voltage regulator)
with the stabilized supply voltage VDD (versions B1, A2, B2) or
with the bandgap voltage (versions A3, B3) (see Fig. 7). At
power-up, when VDD reached VON and VIN reaches the VSH
level, the SAVE output goes high, and the timer starts
running, setting RES high after the time TTO (see Fig. 4). If VIN
falls below VSL, the SAVE output goes low and stays low until
VIN rises again above VSH. If VIN falls below the voltage VRL, the
RES output will go low and the on-chip timer will stop. When
VIN rises again above VSH, the timer will initiate a power-up
sequence. The RES output may however be influenced
independently of the voltage VIN by the timer action, see
section “Combined Voltage and Timer Action”. Monitoring the
rough DC side of the regulator as shown in Fig. 12 is the only
way to have advanced warning at power-down. Spikes on VIN
should be filtered if they are likely to drop below VSL.
The combination of VIN and VDD monitoring provide high
system security: if VIN rises much faster than VDD, then the
device starts the power-on sequence only when VDD reached
VON (Fig. 3). Short circuits on the regulated supply voltage can
be detected.
Voltage Thresholds on VIN
The H6006 is available with 3 different sets of thresholds:
Version B1: with internal voltage divider, resulting in
thresholds for direct monitoring of the unregulated voltage
without external components.
>9V
Voltage
5V
Regulator
VIN
VDD
SAVE
VSS
RES
Note: The threshold levels are 9/8/7 V normally.These
are divided internally by 4 to give internal thres-
holds of 2.25 / 2 / 1.75 V. VDD = 5 V (thresholds
dependent on VDD). RVIN = ~ 100 kΩ.
Fig. 8
Version A2, B2: for monitoring of all unregulated voltage,
where custom programming is required. Fixed resistor
values can be used for programming.
any voltage
Voltage
5V
Regulator
VIN
VDD
SAVE
VSS
RES
Note : the internal threshold levels are 2.25 / 2.00 / 1.75 V
at VDD = 5 V (thresholds dependent on VDD)
RVIN = ~ 100 MΩ.
Fig. 9
Version A3, B3: for monitoring of regulated voltage, where
no unregulated voltage is available (the tolerance is ±10 %,
see Table 4. For tighter tolerances, trimming can be used,
see Fig. 10).
5 V ± 10%
VIN
VDD
SAVE
VSS
RES
Note: the internal threshold levels are 2.00 / 1.95 / 1.90 V
(thresholds dependent on the internal bandgap
reference) RVIN = ~ 100 MΩ.
Fig. 10
Copyright © 2004, EM Microelectronic-Marin SA
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