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FM32L276 データシート(PDF) 4 Page - Ramtron International Corporation

部品番号 FM32L276
部品情報  3V Integrated Processor Companion with Memory
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メーカー  RAMTRON [Ramtron International Corporation]
ホームページ  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM32L276 データシート(HTML) 4 Page - Ramtron International Corporation

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FM32L278/L276/L274/L272 - 3V I2C Companion
Rev. 3.0
Feb. 2009
Page 4 of 21
Overview
The FM32L27x family combines a serial nonvolatile
RAM with 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 FM32L27x 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 F-RAM memory and the companion.
From the system perspective they appear to be two
separate devices with unique IDs on the serial bus.
The FM32L27x provides the same functions as the
FM31L27x with the exception of the real-time clock.
This makes it easy to develop a common design that
can either include timekeeping by using the
FM31L27x or exclude it by using the FM32L27x. All
other features are identical. The register address map
is even preserved so that software can be identical.
The memory is organized as a stand-alone 2-wire
nonvolatile memory with a standard device ID value.
The companion functions are accessed under their
own 2-wire device ID. This allows the companion
functions to be read while maintaining the most
recently used memory address. The companion
functions are controlled by 16 special function
registers. The event counter circuits and related
registers are maintained by the power source on the
VBAK pin, allowing them to operate from battery or
backup capacitor power when VDD drops below a set
threshold. Each functional block is described below.
Memory Operation
The FM32L27x 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 F-RAM 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.
Write protect addresses
WP1
WP0
None
0
0
Bottom 1/4
0
1
Bottom 1/2
1
0
Full array
1
1
Processor Companion
In addition to nonvolatile RAM, the FM32L27x
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 FM32L27x 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 VDD. This allows other reset sources to be wire-
OR’d to the /RST pin. When VDD is above the
programmed trip point, /RST output is pulled weakly
to VDD. If VDD drops below the reset trip point
voltage level (VTP) the /RST pin will be driven low. It
will remain low until VDD falls too low for circuit
operation which is the VRST level. When VDD rises
again above VTP, /RST will continue to drive low for
at least 100 ms (tRPU) to ensure a robust system reset
at a reliable VDD level. After tRPU 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 VDD dropped below VTP.
A memory operation started while VDD is above VTP
will be completed internally.
Figure 2 below illustrates the reset operation in
response to the VDD voltage.
Figure 2. Low Voltage Reset
VDD
VTP
tRPU
RST


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