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PDF FM3316 Data sheet ( Hoja de datos )
| Número de pieza | FM3316 | |
| Descripción | (FM3316 / FM33256) 3V Integrated Processor Companion | |
| Fabricantes | Ramtron International Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FM3316 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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Preliminary
FM33256/FM3316
3V Integrated Processor Companion with Memory
Features
High Integration Device Replaces Multiple Parts
• Serial Nonvolatile Memory
• Real-time Clock (RTC) with Alarm
• Low VDD Detection Drives Reset
• Watchdog Window Timer
• Early Power-Fail Warning/NMI
• 16-bit Nonvolatile Event Counter
• Serial Number with Write-lock for Security
www.DataSheet4U.cFoemrroelectric Nonvolatile RAM
• 256Kb and 16Kb versions
• Unlimited Read/Write Endurance
• 10 year Data Retention
• NoDelay™ Writes
Real-time Clock/Calendar
• Backup Current under 1 µA
• Seconds through Centuries in BCD format
• Tracks Leap Years through 2099
• Uses Standard 32.768 kHz Crystal
• Software Calibration
• Supports Battery or Capacitor Backup
Processor Companion
• Active-low Reset Output for VDD and Watchdog
• Programmable Low-VDD Reset Thresholds
• Manual Reset Filtered and Debounced
• Programmable Watchdog Window Timer
• Nonvolatile Event Counter Tracks System
Intrusions or other Events
• Comparator for Power-Fail Interrupt or Other Use
• 64-bit Programmable Serial Number with Lock
Fast SPI Interface
• Up to 16 MHz Maximum Bus Frequency
• RTC, Supervisor Controlled via SPI Interface
• SPI Mode 0 & 3 (CPOL, CPHA=0,0 & 1,1)
Easy to Use Configurations
• Operates from 2.7 to 3.6V
• Small Footprint “Green” 14-pin SOIC (-G)
• Low Operating Current, 50µA Standby Current
• -40°C to +85°C Operation
Description
The FM33256 and FM3316 are devices that integrate
FRAM memory with the most commonly needed
functions for processor-based systems. Major
features include nonvolatile memory, real-time clock,
low-VDD reset, watchdog timer, nonvolatile event
counter, lockable 64-bit serial number area, and
general purpose comparator that can be used for a
power-fail (NMI) interrupt or other purpose. The
devices operate from 2.7 to 3.6V.
Each FM33xx provides nonvolatile RAM available in
memory capacity of 16Kb and 256Kb. Fast write
speed and unlimited endurance allow the memory to
serve as extra RAM or conventional nonvolatile
storage. This memory is truly nonvolatile rather than
battery backed.
The real-time clock (RTC) provides time and date
information in BCD format. It can be permanently
powered from external backup voltage source, either
a battery or a capacitor. The timekeeper uses a
common external 32.768 kHz crystal and provides a
calibration mode that allows software adjustment of
timekeeping accuracy.
This is a product that has fixed target specifications but are subject
to change pending characterization results.
Rev. 1.0
Dec. 2006
The processor companion includes commonly needed
CPU support functions. Supervisory functions
include a reset output signal controlled by either a
low VDD condition or a watchdog timeout. /RST goes
active when VDD drops below a programmable
threshold and remains active for 100 ms (max.) after
VDD rises above the trip point. A programmable
watchdog timer runs from 60 ms to 1.8 seconds. The
timer may also be programmed for a delayed start,
which functions as a window timer. The watchdog
timer is optional, but if enabled it will assert the reset
signal for 100 ms if not restarted by the host within
the time window. A flag-bit indicates the source of
the reset.
A comparator on PFI compares an external input pin
to the onboard 1.5V reference. This is useful for
generating a power-fail interrupt (NMI) but can be
used for any purpose. The family also includes a
programmable 64-bit serial number that can be
locked making it unalterable. Additionally it offers an
event counter that tracks the number of rising or
falling edges detected on a dedicated input pin. The
counter can be programmed to be non-volatile under
VDD power or battery-backed using only VBAK. If
VBAK is connected to a battery or capacitor, then
events will be counted even in the absence of VDD.
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
http://www.ramtron.com
Page 1 of 28
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60 ms increments via a 5-bit nonvolatile setting
(register 0Ch).
Timebase
100 ms
clock
WR3-0 = 1010b
to restart
Down Counter
/RST
Watchdog
Timer Settings
WDE
Figure 3. Watchdog Timer
The watchdog also incorporates a window timer
feature that allows a delayed start. The starting time
www.DataSheet4U.caonmd ending time defines the window and each may be
set independently. The starting time has 25 ms
resolution and 0 ms to 775 ms range.
Watchdog
Restart
Start
Time
End
Time
Window
RST
100 ms (max)
Figure 4. Window Timer
The watchdog EndTime value is located in register
0Ch, bits 4-0, the watchdog enable is bit 7. The
watchdog is restarted by writing the pattern 1010b to
the lower nibble of register 0Ah. Writing the correct
pattern will also cause the timer to load new timeout
values. Writing other patterns to this address will not
affect its operation. Note the watchdog timer is free-
running. Prior to enabling it, users should restart the
timer as described above. This assures that the full
timeout is provided immediately after enabling. The
watchdog is disabled when VDD drops below VTP.
Note setting the EndTime timeout setting to all
zeroes (00000b) disables the timer to save power.
The listing below summarizes the watchdog bits.
Watchdog StartTime
Watchdog EndTime
Watchdog Enable
Watchdog Restart
Watchdog Flags
WDST4-0 0Bh, bits 4-0
WDET4-0 0Ch, bits 4-0
WDE
0Ch, bit 7
WR3-0 0Ah, bits 3-0
EWDF, 09h, bit 7
LWDF 09h, bit 6
The programmed StartTime value is a guaranteed
maximum time while the EndTime value is a
guaranteed minimum time, and both vary with
temperature and VDD voltage. The watchdog has two
additional controls associated with its operation. The
nonvolatile enable bit WDE allows the /RST to go
Rev. 1.0
Dec. 2006
FM33256/FM3316 SPI Companion w/ FRAM
active if the watchdog reaches the timeout without
being restarted. If a reset occurs, the timer will restart
on the rising edge of the reset pulse. If WDE is not
enabled, the watchdog timer still runs but has no
effect on /RST. The second control is a nibble that
restarts the timer, thus preventing a reset. The timer
should be restarted after changing the timeout value.
This procedure must be followed to properly load the
watchdog registers:
Address
1. Write the StartTime value
0Bh
2. Write the EndTime value and WDE=1 0Ch
3. Issue a Restart command
0Ah
The restart command in step 3 must be issued before
tDOG2, which was programmed in step 2. The window
timer starts counting when the restart command is
issued.
Manual Reset
The /RST is a bi-directional signal allowing the
FM33xx to filter and de-bounce a manual reset
switch. The /RST input detects an external low
condition and responds by driving the /RST signal
low for 100 ms (max.). This effectively filters and de-
bounces a reset switch. After this timeout (tRPW), the
user may continue pulling down on the /RST pin, but
SPI commands will not be locked out.
MCU
Reset
Switch
RST
FM33xx
Switch
Behavior
RST
FM33xx
drives
100 ms (max.)
Figure 5. Manual Reset
Note the internal weak pull-up eliminates the need
for additional external components.
Reset Flags
In case of a reset condition, a flag bit will be set to
indicate the source of the reset. A low-VDD reset is
indicated by the POR bit, register 09h bit 5. There are
two watchdog reset flags - one for an early fault
(EWDF) and the other for a late fault (LWDF),
located in register 09h bits 7 and 6. A manual reset
will result in no flag being set, so the absence of a
flag is a manual reset. Note that the bits are set in
response to reset sources but they must be cleared by
the user. It is possible to read the register and have
Page 5 of 28
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512.0033
512.0056
512.0078
512.0100
512.0122
512.0144
512.0167
512.0189
512.0211
512.0233
512.0256
512.0278
512.0300
512.0322
512.0344
512.0367
512.0389
512.0411
512.0433
512.0456
512.0478
512.0500
512.0522
512.0544
512.0567
512.0589
512.0611
512.0633
512.0656
512.0678
512.0056
512.0078
512.0100
512.0122
512.0144
512.0167
512.0189
512.0211
512.0233
512.0256
512.0278
512.0300
512.0322
512.0344
512.0367
512.0389
512.0411
512.0433
512.0456
512.0478
512.0500
512.0522
512.0544
512.0567
512.0589
512.0611
512.0633
512.0656
512.0678
512.0700
6.52
10.86
15.20
19.54
23.88
28.22
32.56
36.90
41.24
45.58
49.92
54.26
58.60
62.94
67.28
71.62
75.96
80.30
84.64
88.98
93.32
97.66
102.00
106.34
110.68
115.02
119.36
123.70
128.04
132.38
FM33256/FM3316 SPI Companion w/ FRAM
10.85
15.19
19.53
23.87
28.21
32.55
36.89
41.23
45.57
49.91
54.25
58.59
62.93
67.27
71.61
75.95
80.29
84.63
88.97
93.31
97.65
101.99
106.33
110.67
115.01
119.35
123.69
128.03
132.37
136.71
000010
000011
000100
000101
000110
000111
001000
001001
001010
001011
001100
001101
001110
001111
010000
010001
010010
010011
010100
010101
010110
010111
011000
011001
011010
011011
011100
011101
011110
011111
Rev. 1.0
Dec. 2006
Page 11 of 28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet FM3316.PDF ] | |
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