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FM3104/16/64/256
Integrated Processor Companion with Memory
Features
High Integration Device Replaces Multiple Parts
•
Serial Nonvolatile Memory
•
Real-time Clock (RTC)
•
Low Voltage Reset
•
Watchdog Timer
•
Early Power-Fail Warning/NMI
•
Two 16-bit Event Counters
•
Serial Number with Write-lock for Security
Ferroelectric Nonvolatile RAM
•
4Kb, 16Kb, 64Kb, and 256Kb 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 (6pF)
•
Software Calibration
•
Supports Battery or Capacitor Backup
Processor Companion
•
Active-low Reset Output for V
DD
and Watchdog
•
Programmable V
DD
Reset Trip Point
•
Manual Reset Filtered and De-bounced
•
Programmable Watchdog Timer
•
Dual Battery-backed Event Counter Tracks
System Intrusions or other Events
•
Comparator for Early Power-Fail Interrupt
•
64-bit Programmable Serial Number with Lock
Fast Two-wire Serial Interface
•
Up to 1 MHz Maximum Bus Frequency
•
Supports Legacy Timing for 100 kHz & 400 kHz
•
Device Select Pins for up to 4 Memory Devices
•
RTC, Supervisor Controlled via 2-wire Interface
Easy to Use Configurations
•
Operates from 2.7 to 5.5V
•
Small Footprint 14-pin SOIC
•
Low Operating Current
•
-40°C to +85°C Operation
Description
The FM31xxx is a family of integrated devices that
includes the most commonly needed functions for
processor-based systems. Major features include
nonvolatile memory available in various sizes, 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 an early power-fail (NMI) interrupt or
other purpose. The family operates from 2.7 to 5.5V.
Each FM31xxx provides nonvolatile RAM available
in sizes including 4Kb, 16Kb, 64Kb, and 256Kb
versions. 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 in development. Characteristic data
and other specifications are subject to change without notice.
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 after VDD
rises above the trip point. A programmable watchdog
timer runs from 100 ms to 3 seconds. The watchdog
timer is optional, but if enabled it will assert the reset
signal for 100 ms if not restarted by the host before
the timeout. A flag-bit indicates the source of the
reset.
A general-purpose comparator compares an external
input pin to the onboard 1.2V 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 a
dual battery-backed event counter that tracks the
number of rising or falling edges detected on
dedicated input pins.
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
www.ramtron.com
Rev 0.2
May 2003
Page 1 of 22
FM3104/16/64/256
Pin Configuration
CNT1
CNT2
A0
A1
CAL/PFO
RST
VSS
1
2
3
4
5
6
7
14
13
12
11
10
9
8
VDD
SCL
SDA
X2
X1
PFI
VBAK
Pin Name
CNT1, CNT2
A0, A1
CAL/PFO
/RST
PFI
X1, X2
SDA
SCL
VBAK
VDD
VSS
Function
Event Counter Inputs
Device Select inputs
Clock Calibration and Early
Power-fail Output
Reset Input/Output
Early Power-fail Input
Crystal Connections
Serial Data
Serial Clock
Battery-Backup Supply
Supply Voltage
Ground
Ordering Information
Base Configuration
FM31256
FM3164
FM3116
FM3104
Memory Size
256Kb
64Kb
16Kb
4Kb
Operating Voltage
2.7-5.5V
2.7-5.5V
2.7-5.5V
2.7-5.5V
Reset Threshold
2.6V, 2.9, 3.9, 4.4V
2.6V, 2.9, 3.9, 4.4V
2.6V, 2.9, 3.9, 4.4V
2.6V, 2.9, 3.9, 4.4V
Ordering Part Number
FM31256-S
FM3164-S
FM3116-S
FM3104-S
Other memory configurations may be available. Please contact the factory for more information.
Rev 0.2
May 2003
Page 2 of 22
FM3104/16/64/256
A1, A0
SCL
SDA
2-Wire
Interface
LockOut
FRAM
Array
LockOut
RST
Watchdog
LV Detect
Special
Function
Registers
S/N
RTC Cal.
RTC Registers
X1
PFI
+
CAL/PFO
-
2.5V
1.2V
RTC
X2
512Hz
Event
Counters
CNT1
CNT2
-
+
VDD
Switched Power
VBAK
Nonvolatile
Battery Backed
Figure 1. Block Diagram
Pin Descriptions
Pin Name
A0, A1
CNT1, CNT2
CAL/PFO
X1, X2
/RST
SDA
Type
Input
Input
Output
I/O
I/O
I/O
Pin Description
Device select inputs are used to address multiple memories on a serial bus. To select
the device the address value on the two pins must match the corresponding bits
contained in the device address. The device select pins are pulled down internally.
Event Counter Inputs: These battery-backed inputs increment counters when an edge is
detected on the corresponding CNT pin. The polarity is programmable.
In calibration mode, this pin supplies a 512 Hz square-wave output for clock
calibration. In normal operation, this is the early power-fail output.
32.768 kHz crystal connection. When using an external oscillator, apply the clock to
X2 and leave X1 floating.
Active low reset output with weak pull-up. Also input for manual reset.
Serial Data & Address: This is a bi-directional line for the two-wire interface. It is
open-drain and is intended to be wire-OR’d with other devices on the two-wire bus.
The input buffer incorporates a Schmitt trigger for noise immunity and the output
driver includes slope control for falling edges. A pull-up resistor is required.
Serial Clock: The serial clock line for the two-wire interface. Data is clocked out of the
part on the falling edge, and in on the rising edge. The SCL input also incorporates a
Schmitt trigger input for noise immunity.
Early Power-fail Input: Typically connected to an unregulated power supply to detect
an early power failure. This pin should not be left floating.
Backup supply voltage: A 3V battery or a large value capacitor. If V
DD
<3.6V and no
backup supply is used, this pin should be tied to V
DD
. If V
DD
>3.6V and no backup
supply is used, this pin should be left floating and the VBC bit should be set.
Supply Voltage.
Ground
SCL
PFI
VBAK
VDD
VSS
Input
Input
Supply
Supply
Supply
Rev 0.2
May 2003
Page 3 of 22
FM3104/16/64/256
Overview
The FM31xxx family combines a serial nonvolatile
RAM with a real-time clock (RTC) and a processor
companion. The companion is a highly integrated
peripheral including a processor supervisor, a
comparator used for early power-fail warning,
nonvolatile event counters, and a 64-bit serial
number.
The
FM31xxx
integrates
these
complementary but distinct functions that share a
common interface in a single package. Although
monolithic, the product is organized as two logical
devices,
the
FRAM
memory
and
the
RTC/companion. From the system perspective they
appear to be two separate devices with unique IDs on
the serial bus.
The memory is organized as a stand-alone 2-wire
nonvolatile memory with a standard device ID value.
The real-time clock and supervisor functions are
accessed with a separate 2-wire device ID. This
allows clock/calendar data to be read while
maintaining the most recently used memory address.
The clock and supervisor functions are controlled by
25 special function registers. The RTC and event
counter circuits are maintained by the power source
on the VBAK pin, allowing them to operate from
battery or backup capacitor power when V
DD
drops
below an internally set threshold. Each functional
block is described below.
Write protect addresses
None
Bottom 1/4
Bottom 1/2
Full array
WP1
0
0
1
1
WP0
0
1
0
1
Processor Companion
In addition to nonvolatile RAM, the FM31xxx family
incorporates a highly integrated processor
companion. It includes a low voltage reset, a
programmable watchdog timer, battery-backed event
counters, a comparator for early power-fail detection
or other purposes, and a 64-bit serial number.
Processor Supervisor
Supervisors provide a host processor two basic
functions: detection of power supply fault conditions
and a watchdog timer to escape a software lockup
condition. All FM31xxx devices have a reset pin
(/RST) to drive the processor reset input during
power faults (and power-up) and software lockups. It
is an open drain output with a weak internal pull-up
to V
DD
. This allows other reset sources to be wire-
OR’d to the /RST pin. When V
DD
is above the
programmed trip point, /RST output is pulled weakly
to V
DD
. If V
DD
drops below the reset trip point
voltage level (V
TP
) the /RST pin will be driven low. It
will remain low until V
DD
falls too low for circuit
operation which is the V
RST
level. When V
DD
rises
again above V
TP
, /RST will continue to drive low for
at least 100 ms (t
RPU
) to ensure a robust system reset
at a reliable V
DD
level. After t
RPU
has been met, the
/RST pin will return to the weak high state. While
/RST is asserted, serial bus activity is locked out even
if a transaction occurred as V
DD
dropped below V
TP
.
A memory operation started while V
DD
is above V
TP
will be completed internally.
The bits VTP1 and VTP0 control the trip point of the
low voltage detect circuit. They are located in register
0Bh, bits 1 and 0. The figure below illustrates the
reset operation in response to the V
DD
voltage.
V
TP
2.6V
2.9V
3.9V
4.4V
VDD
VTP
t
RPU
Memory Operation
The FM31xxx is a family of products available in
different memory sizes including 4Kb, 16Kb, 64Kb,
and 256Kb. The family is software compatible, all
versions use consistent two-byte addressing for the
memory device. This makes the lowest density
device different from its stand-alone memory
counterparts but makes them compatible within the
entire family.
Memory is organized in bytes, for example the 4Kb
memory is 512 x 8 and the 256Kb memory is 32,768
x 8. The memory is based on FRAM technology.
Therefore it can be treated as RAM and is read or
written at the speed of the two-wire bus with no
delays for write operations. It also offers effectively
unlimited write endurance unlike other nonvolatile
memory technologies. The 2-wire interface protocol
is described further on page 13.
The memory array can be write-protected by
software. Two bits in the processor companion area
(WP0, WP1 in register 0Bh) control the protection
setting as shown in the following table. Based on the
setting, the protected addresses cannot be written and
the 2-wire interface will not acknowledge any data to
protected addresses. The special function registers
containing these bits are described in detail below.
Rev 0.2
May 2003
VTP1
0
0
1
1
VTP0
0
1
0
1
RST
Figure 2. Low Voltage Reset
Page 4 of 22
FM3104/16/64/256
The watchdog timer can also be used to assert the
reset signal (/RST). The watchdog is a free running
programmable timer. The period can be software
programmed from 100 ms to 3 seconds in 100 ms
increments via a 5-bit nonvolatile register. All
programmed settings are minimum values and vary
with temperature according to the operating
specifications. The watchdog has two additional
controls associated with its operation, a watchdog
enable bit (WDE) and timer restart bits (WR). Both
the enable bit must be set and the watchdog must
timeout in order to drive /RST active. If a reset event
occurs, the timer will automatically restart on the
rising edge of the reset pulse. If not enabled, the
watchdog timer runs but has no effect on /RST. Note
that setting the maximum timeout setting (11111b)
disables the counter to save power. The second
control is a nibble that restarts the timer preventing a
reset. The timer should be restarted after changing the
timeout value.
The watchdog timeout value is located in register
0Ah, bits 4-0, and the watchdog enable is bit 7. The
watchdog is restarted by writing the pattern 1010b to
the lower nibble of register 09h. Writing this 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 period will be set immediately after enabling.
The watchdog is disabled when V
DD
is below V
TP
.
The following table summarizes the watchdog bits. A
block diagram follows.
Watchdog timeout
Watchdog enable
Watchdog restart
WDT4-0
WDE
WR3-0
0Ah, bits 4-0
0Ah, bit 7
09h, bits 3-0
MCU
RST
FM31xxx
Reset
Switch
Switch
Behavior
RST
FM31xxx
drives
100 ms
Figure 4. Manual Reset
Note that an internal weak pull-up on /RST
eliminates the need for additional external
components.
Reset Flags
In case of a reset condition, a flag will be set to
indicate the source of the reset. A low V
DD
reset is
indicated by the POR flag, register 09h bit 6. A
watchdog reset is indicated by the WTR flag, register
09h bit 7. A manual reset will result in no flag being
set, so the absence of a flag is a manual reset. Note
that the flags are internally set in response to reset
sources, but they must be cleared by the user. When
the register is read, it is possible that both flags are
set if both have occurred since the user last cleared
them.
Early Power Fail Comparator
An early power fail warning can be provided to the
processor well before V
DD
drops out of spec. The
comparator is used to create a power fail interrupt
(NMI). This can be accomplished by connecting the
PFI pin to the unregulated power supply via a resistor
divider. An application circuit is shown below. The
voltage on the PFI input pin is compared to an
onboard 1.2V reference. When the PFI input voltage
drops below this threshold, the comparator will drive
the CAL/PFO pin to a low state. The comparator has
300 mV (nominal) of hysteresis to reduce noise
sensitivity.
Regulator
100 ms
clock
Timebase
WR3-0 = 1010b to restart
Counter
Watchdog
timeout
/RST
VDD
WDE
Figure 3. Watchdog Timer
Manual Reset
The /RST pin is bi-directional and allows the
FM31xxx 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.
FM31xxx
PFI
To MCU CAL/PFO
NMI input
+
-
1.2V ref
Figure 5. Comparator as Early Power-Fail Warning
Rev 0.2
May 2003
Page 5 of 22
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