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SMS45 Arkusz danych(PDF) 2 Page - Summit Microelectronics, Inc.

Numer części SMS45
Szczegółowy opis  Quad Programmable Precision Cascade Sequencer and Supervisory Controller with 4k-Bit Nonvolatile Memory
PDF  20 Pages
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Producent  SUMMIT [Summit Microelectronics, Inc.]
Strona internetowa  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMS45 Arkusz danych(HTML) 2 Page - Summit Microelectronics, Inc.

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SMS45
2079 1.2 05/24/04
SUMMIT MICROELECTRONICS, Inc.
Preliminary Information
INTERNAL BLOCK DIAGRAM
Time based sequencing has the ability to turn supplies on
in a specific order. However, it cannot guarantee that each
supply has reached valid voltage levels before the next
supply is sequenced on. Cascade sequencing guarantees
the supplies are enabled a programmed period of time after
the previous voltage has reached its minimum pro-
grammed valid level. Figure 1 shows that each succeeding
voltage must reach its minimum valid level before the timer
is started to time the interval, t, for the next voltage. The
duration of each t is programmable for each supply to
supply transition. The next supply is not enabled until the
timer has elapsed. See also Figure 5.
Figure 1. Cascading Power Supplies
CASCADE SEQUENCING
0V
4V
2V
6V
T
t
t
t
5V
2.5V
3.3V
1.8V
5V Valid
3.3V Valid
2.5V Valid
2047 Fig01
V
+
–
REF
NV DAC
+
–
REF
NV DAC
+
–
REF
NV DAC
+
–
REF
NV DAC
V0 16
V1 2
V2 3
V3 14
MR# 1
PROGRAMMABLE
WATCHDOG
TIMER
PROGRAMMABLE
RESET PULSE
GENERATOR
SERIAL
BUS
CONTROL
LOGIC
4K-BIT NV
MEMORY
RESET#
PUP#1
11
5
4
SDA
VDD_CAP
WLDI
9
15
10
PUP#2
PUP#3
13
SCL
A2
7
6
A1
CONFIGURATION
REGISTER
CONFIGURATION
REGISTER
GND
8
PROGRAMMABLE
POWER
CASCADING
VDD_CAP
50k
Ω
50k
Ω
12
SUPPLY
ARBITRATION
V3
V2
V1
V0
VDD_CAP



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