FM3104 Datasheet, PDF (3/22 Pages) List of Unclassifed Manufacturers – Integrated Processor Companion with Memory

FM3104/16/64/256
A1, A0
SCL
SDA
2-Wire
Interface
LockOut
FRAM
Array
LockOut
RST
PFI
CAL/PFO
VDD
2.5V ^-
+
VBAK
Watchdog
LV Detect
Special
Function
Registers
S/N
+
- ^1.2V
RTC Cal.
512Hz
Switched Power
RTC Registers
RTC
Event
Counters
X1
X2
CNT1
CNT2
Nonvolatile
Battery Backed
Figure 1. Block Diagram
Pin Descriptions
Pin Name
A0, A1
Type
Input
CNT1, CNT2 Input
CAL/PFO
Output
X1, X2
I/O
/RST
I/O
SDA
I/O
SCL
PFI
VBAK
VDD
VSS
Input
Input
Supply
Supply
Supply
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
Rev 0.2
May 2003
Page 3 of 22