SP691AEB/03
SP691A/693A Evaluation Board Manual
Copyright 2000 Sipex Corporation
1
The SP691A/693A Evaluation Board is designed to help analyze the many functions of the
SP691A/693A
P Supervisory circuit. The evaluation board provides easy probe access
points to all SP691A/693A pins so that the user can measure electrical characteristics and
waveforms of each signal. The SP691A/693A Evaluation Board also provides solder pads
for DIP or SOIC packages, as well as options for DIP or SOIC sockets for easy evaluation of
multiple devices.
The next two sections describe the SP691A/693A Board Layout and Using the SP691A/
693A Evaluation Boards. A table of SP691A/693A Pin Assignments is also included with a
section on Power Supply Connections. A SP691A/693A Evaluation Board List of Materials is
provided with some manufacturers part numbers to use as a reference. Finally, a schematic
is included of the SP691A/693A Evaluation Board.
DESCRIPTION
s
Easy Evaluation for the
SP691A/693A Microprocessor
Supervisory Circuit
s
Probe Points Accessible
for all SP691A/693A
Pins & Input Options
s
16 Pin Narrow SOIC or DIP
Sockets Available for the
SP691A/693A Circuit
s
Pin compatible upgrade to
MAX691A, 693A, 800L, 800M
SP691A/693A
Evaluation Board Manual
SP691AEB/03
SP691A/693A Evaluation Board Manual
Copyright 2000 Sipex Corporation
2
BOARD LAYOUT
The SP691A/693A Evaluation Board has been
designed to easily and conveniently provide
access to all pins of the SP691A/693A device
under test. Position the board with the silkscreen
lettering upright (also see drawing on the front
page of this manual) and you will see two
vertical rows of eight pins each, which represent
the 16 pins of the SP691A/693A device starting
in the top left with V
BATT
as pin one. The pin
receptacles are raised female pins which can
accommodate easy-hook connection leads for
power and meter connections, as well as scope
probe hooks and grounds for waveform
measurements.
The 16 pin SP691A/693A may be installed in
one of 3 locations: U1 for DIP or DIP sockets,
U3 for SOICs or U2 for SOIC sockets. The five
input pins for the SP691A/693A are provided
with extra Input Probe Points for connecting
inputs to these pins. For example pin 11 WDI
has nearby pins V
OUT
and GND to connect to for
evaluation of WDI timeout. These female
receptacle pins can be jumpered together with
easy-hook connectors or stripped back solid wire
leads. In the case of inputs OSC IN, OSC SEL
or PFI, a resistor or capacitor with leads may be
pushed into the female receptacle pins to make
easy connections. Also, mating male pins (see
List of Materials) may be soldered to the
components and inserted into the receptacle pins.
USING THE EVALUATION BOARD
Connect the SP691A/693A Evaluation Board
to the power supplies for V
CC
and V
BATT
(see the section Power Supply Connections
following the table SP691A/693A Pin
Assignments). It is good practice to not switch
power on until power connections are made to
the evaluation board.
Evaluating Pin Functions
Pin 1 V
BATT
Backup-Battery Input.
Connect to external supply, battery or capacitor
and charging circuit. If this pin is not used,
connect to GND.
Pin 2 V
OUT
Output Supply Voltage. This
function is used to provide power supply
switching of either V
CC
or V
BATT
to an
external device like a CMOS RAM to ensure a
constant supply for the memory. To evaluate this
function, vary the V
CC
voltage for a set V
BATT
voltage until you simulate the following
conditions: V
OUT
connects to V
CC
when V
CC
is
greater than V
BATT
and V
CC
is above the reset
threshold. When V
CC
falls below V
BATT
and V
CC
is below the reset threshold, V
OUT
connects to
V
BATT
. Start with V
BATT
voltage of about 2.8 to
4.0V and vary V
CC
from 0V to 5V to 0V and
observe V
OUT
. (Note: a 0.1
F bypass
capacitor (C1) is connected from V
OUT
to GND).
Connect V
OUT
to V
CC
if no backup battery is used.
Pin 3 V
CC
Input Supply Voltage - +5V input.
A 0.1(F bypass capacitor (C2) is connected
from V
CC
to GND.
Pin 4 GND Ground reference for all signals.
Pin 5 BATT ON Battery On Output. Goes
high when V
OUT
switches to V
BATT
. Goes
low when V
OUT
switches to V
CC
. Connect
the base of a PNP through a current-limiting
resistor to BATT ON for V
OUT
current
requirements greater than 250mA.
Pin 6 - LOWLINE - LOWLINE Output goes
low when V
CC
falls below the reset threshold.
It returns high as soon as V
CC
rises above the
reset threshold. The output can be used to
generate a NMI (non-maskable interrupt) if the
unregulated supply is inaccessible.
SP691AEB/03
SP691A/693A Evaluation Board Manual
Copyright 2000 Sipex Corporation
3
Pin 7 OSC IN External Oscillator Input.
When OSC SEL is unconnected or driven high,
a 10
A pull-up connects from V
OUT
to OSC IN,
the internal oscillator sets the reset and watchdog
timeout periods, and OSC IN selects between
fast and slow watchdog timeout periods. When
OSC SEL is driven low, the reset and watchdog
timeout periods may be set either by a capacitor
from OSC IN to ground or by an external clock
at OSC IN.
Pin 8 OSC SEL Oscillator Select. When OSC
SEL is unconnected or driven high, the internal
oscillator sets the reset and watchdog timeout
periods. When OSC SEL is low, the external
oscillator input (OSC IN) is enabled. OSC SEL
has a 10
A pull-up.
Pin 9 PFI Power-Fail Input. This is the
non-inverting input to the power-fail comparator.
When PFI is less than 1.25V, PFO_N goes low.
Connect PFI to GND or VOUT when not used.
Connect external divider R1 & R2 to Probe Pins
and connect Unregulated Voltage to UNREG
for Power Fail monitoring.
Pin 10 PFO Power-Fail Output. This is the
output of the power-fail comparator. PFO, goes
low when PFI is less than 1.25V. This is an
uncommitted comparator, and has no effect on
any other internal circuitry.
Pin 11 WDI Watchdog Input. WDI is a
three-level input. If WDI remains either high or
low for longer than the watchdog timeout
period, WDO goes low and reset is asserted for
the reset timeout period. WDO remains low
until the next transition at WDI. Leaving WDI
unconnected disables the watchdog function.
WDI connects to an internal voltage divider
between V
OUT
and GND, which sets it to
mid-supply when left unconnected. For a simple
check of watchdog function, connect WDI to
either Probe pins GND or V
OUT
to cause WDO
to go to a Logic Low.
Pin 12 CE OUT Chip-Enable Output. The
Chip-Enable (CE) function CE OUT provides
internal gating of chip enable signals to prevent
erroneous data from corrupting the CMOS RAM
in the event of a power failure. During normal
operation, the CE gate is enabled and all CE
transitions are passed from CE IN to CE OUT.
When Reset is asserted, this path is disabled.
Note that CE OUT goes low (active) only when
CE IN is low and V
CC
is above the reset threshold.
If CE IN is low when reset is asserted, CE OUT
will stay low for 12
s or until CE IN goes high,
whichever occurs first.
Pin 13 CE IN Chip-Enable Input. The Input
to chip-enable gating circuit. Connect to GND
or V
OUT
if not used.
Pin 14 WDO Watchdog Output. WDO goes
low and reset is asserted if WDI remains either
high or low longer than the watchdog timeout
period. WDO returns high on the next transition
at WDI. WDO remains high if WDI is
unconnected. WDO is also high when RESET
is asserted.
Pin 15 RESET RESET output goes low
whenever V
CC
falls below the reset threshold.
RESET will remain low for 200ms (when
internal oscillator is used) after V
CC
crosses the
reset threshold on power-up.
Pin 16 RESET RESET Output goes high
whenever V
CC
falls below the reset threshold.
RESET is open drain and is the inverse of
RESET.
Note: To accurately measure the extremely small
supply current in Battery Back-up mode, you
need to cut split pads SP1 & SP2 (solder side
of board) severing connections to C1 & C2
which would have leakage currents in the
measurement range. Also, remove charging
circuit components CBATT and D1 if they are
installed.
SP691AEB/03
SP691A/693A Evaluation Board Manual
Copyright 2000 Sipex Corporation
4
Pin #
Pin Name
Pin Function
Active Level
Input Pin Points
1
V
BATT
Backup-Battery Input
NA
2
V
OUT
Output Supply Voltage
NA
3
V
CC
Input Supply Voltage
NA
4
GND
Ground for all Signals
NA
5
BATT ON
Battery On Output
HIGH
6
LOWLINE
Lowline Output
LOW
7
OSC IN
Oscillator Input
NA
V
OUT
& GND
8
OSC SEL
Oscillator Select
NA
V
OUT
& GND
9
PFI
Power-Fail Input
HIGH
R1 & R2
10
PFO
Power-Fail Output
LOW
11
WDI
Watchdog Input
Transitions
V
OUT
& GND
12
CE OUT
Chip-Enable Output
LOW
13
CE IN
Chip-Enable Input
LOW
V
OUT
& GND
14
WDO
Watchdog Output
LOW
15
RESET
RESET Output
LOW
16
RESET
RESET Output
HIGH
SP691A/693A Pin Assignments
Power Supply Connections
Pin 3 V
CC
connect to external +5 VDC supply.
Pin 1 V
BATT
connect to external V+ supply of 2.8 to 4.0 VDC, or install capacitor C
BATT
and charging diode D1 (see List of Materials).
Pin 4 GND connect to negative or ground of +5VDC supply and ground of V+ supply for V
BATT
Note: Ensure V
CC
, V
BATT
and GND connections are made before operating device.
SP691AEB/03
SP691A/693A Evaluation Board Manual
Copyright 2000 Sipex Corporation
5
Component
Part Number
Manufacturer
Ref. Des.
Qty.
P Supervisor IC
SP691ACN
Sipex
U3
1
Pin Receptacle-Female
300-1150-1472-7040
Mil-Max Mfg.
26
Ceramic Capacitor 0.1
F
Generic
C1, 2
2
Al. Spacers - 0.5"
8414
Keystone Elec.
4
6-32 Hex Nut
Generic
4
Optional:
16 Pin DIP Socket
216-3340-00-0602
3M-Textool
U1
1
16 Pin SOIC Socket
216-7383-55-1902
3M-Textool
U2
1
Maxcap 1F 5.5V
LC055105A
Cesiwid Inc.
CBATT
1
Signal Diode
Generic
D1
1
Pin Receptacle-Male
3137-3002-10-0080
Mill-Max Mfg.
26
SP691A/693A Evaluation Board List of Materials
SP691AEB/03
SP691A/693A Evaluation Board Manual
Copyright 2000 Sipex Corporation
6
SP691A/693A Evaluation Board Schematic
SP691AEB/03
SP691A/693A Evaluation Board Manual
Copyright 2000 Sipex Corporation
7
Model
Package
SP691ANEB ....................................................................................................... SP691ACN Evaluation Board
ORDERING INFORMATION
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
Sipex Corporation
Headquarters and
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
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