FM6124 Ramtron Corporation, FM6124 Datasheet - Page 2

• Manufacturer Part Number: FM6124
• Description: Event Data Recorder With F-ram
• Manufacturer: Ramtron Corporation

PIN DESCRIPTION
Rev. 1.1
Dec. 2007
26, 27
20-24
40-44
Pin
10
11
12
13
14
15
16
17
18
19
25
28
29
30
31
32
33
34
35
36
37
38
39
1
2
3
4
5
6
7
8
9
RESET
Name
VBAK
RSTB
VDD
VDD
VDD
ACS
CNT
SDA
IN10
IN11
VSS
SCL
VSS
VSS
PFO
INT
IN4
IN5
IN6
IN7
IN8
IN9
IN3
IN2
IN1
IN0
PFI
NC
NC
NC
A0
A1
X1
X2
Supply
Supply
Supply
VSS
VSS
I/O
NC
NC
NC
NC
O
O
I
I
I
I
I
I
I
I
I
I
I
Ground
Alarm/Calibration/SquareWave: This is an open-drain output that requires an external pull-up resistor. In normal operation, this
pin acts as the active-low alarm output. In Calibration mode, a 512 Hz square-wave is driven out. In SquareWave mode, the user
may select a frequency of 1, 512, 4096, or 32768 Hz to be used as a continuous output. The SquareWave mode is entered by
clearing the AL/SW and CAL bits in register 18h.
Event Counter Input: This input increments the counter when an edge is detected on this pin. The polarity is programmable and
the counter value is nonvolatile or battery-backed, depending on the mode. This pin should be tied to ground if unused.
Active Low output that can be configured to generate a low level when:
-Event buffer is full
-Activity on event input
Device Reset Input. This active-low input clears all volatile registers. Leave unconnected if not used, pin has internal pull-up.
Event Input Pin 4
Event Input Pin 5
Event Input Pin 6
Event Input Pin 7
Serial Clock: The serial clock input for the two-wire interface. Data is clocked out of the device on the SCL falling edge, and
clocked in on the SCL rising edge. A pull-up resistor is required.
Serial Data/Address: This is a bi-directional pin used to shift serial data and addresses for the two-wire interface. It employs an
open-drain output and is intended to be wire-OR’d with other devices on the two-wire bus. A pull-up resistor is required.
Ground
Supply voltage
Event Input Pin 8
Event Input Pin 9
Event Input Pin 10
Event Input Pin 11
Address 1-0: These pins are used to select one of up to 4 devices of the same type on the same two-wire bus. To select the
device, the address value on the three pins must match the corresponding bits contained in the device address.
Leave these pins unconnected
Supply voltage
Leave these pins unconnected
Event Input Pin 3
Event Input Pin 2
Event Input Pin 1
Event Input Pin 0
32.768 kHz crystal connection. When using an external oscillator, apply the clock to X1 and a DC mid-level to X2 (see Crystal
Type section for suggestions).
32.768 kHz crystal connection
Ground
Reset Out: This active-low output is open drain with weak pull-up. It is also an input when used as a manual reset. This pin
should be left floating if unused.
Early Power-fail Output: This pin is the early power-fail output and is typically used to drive a microcontroller NMI pin. PFO
drives low when the PFI voltage is <1.5V.
Early Power-fail Input: Typically connected to an unregulated power supply to detect an early power failure. This pin must be
tied to ground if unused.
Backup supply voltage: A 3V battery or a large value capacitor. If no backup supply is used, this pin should be tied to VSS and
the VBC bit should be cleared.
Supply voltage
Leave these pins unconnected
QFP-44 PACKAGE PINOUT
Function
FM6124 Event Data Recorder
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