View SP691ANEB_94745.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

(R)
SP691A/693A
Evaluation Board Manual
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
DESCRIPTION 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.
SP691AEB/03
SP691A/693A Evaluation Board Manual
(c) Copyright 2000 Sipex Corporation
1
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 VBATT 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 VOUT 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.
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 - VOUT - 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 VCC voltage for a set VBATT voltage until you simulate the following conditions: VOUT connects to VCC when VCC is greater than VBATT and VCC is above the reset threshold. When VCC falls below VBATT and VCC is below the reset threshold, VOUT connects to VBATT. Start with VBATT voltage of about 2.8 to 4.0V and vary VCC from 0V to 5V to 0V and observe V OUT . (Note: a 0.1F bypass capacitor (C1) is connected from VOUT to GND). Connect VOUT to VCC if no backup battery is used. Pin 3 - VCC - Input Supply Voltage - +5V input. A 0.1(F bypass capacitor (C2) is connected from VCC 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 VCC falls below the reset threshold. It returns high as soon as VCC rises above the reset threshold. The output can be used to generate a NMI (non-maskable interrupt) if the unregulated supply is inaccessible.
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.
SP691AEB/03
SP691A/693A Evaluation Board Manual
(c) Copyright 2000 Sipex Corporation
2
Pin 7 - OSC IN - External Oscillator Input. When OSC SEL is unconnected or driven high, a 10A pull-up connects from VOUT 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 10A 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 VOUT 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.
SP691AEB/03
When Reset is asserted, this path is disabled. Note that CE OUT goes low (active) only when CE IN is low and VCC is above the reset threshold. If CE IN is low when reset is asserted, CE OUT will stay low for 12s 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 VOUT 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 VCC falls below the reset threshold. RESET will remain low for 200ms (when internal oscillator is used) after VCC crosses the reset threshold on power-up. Pin 16 - RESET - RESET Output goes high whenever VCC 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.
SP691A/693A Evaluation Board Manual
(c) Copyright 2000 Sipex Corporation
3
SP691A/693A Pin Assignments
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin Name VBATT VOUT VCC GND BATT ON LOWLINE OSC IN OSC SEL PFI PFO WDI CE OUT CE IN WDO RESET RESET Pin Function Backup-Battery Input Output Supply Voltage Input Supply Voltage Ground for all Signals Battery On Output Lowline Output Oscillator Input Oscillator Select Power-Fail Input Power-Fail Output Watchdog Input Chip-Enable Output Chip-Enable Input Watchdog Output RESET Output RESET Output Active Level NA NA NA NA HIGH LOW NA NA HIGH LOW Transitions LOW LOW LOW LOW HIGH VOUT & GND VOUT & GND VOUT & GND VOUT & GND R1 & R2 Input Pin Points
Power Supply Connections
Pin 3 - VCC - connect to external +5 VDC supply. Pin 1 - VBATT - connect to external V+ supply of 2.8 to 4.0 VDC, or install capacitor CBATT 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 VBATT Note: Ensure VCC, VBATT and GND connections are made before operating device.
SP691AEB/03
SP691A/693A Evaluation Board Manual
(c) Copyright 2000 Sipex Corporation
4
SP691A/693A Evaluation Board List of Materials
Component P Supervisor IC Pin Receptacle-Female Ceramic Capacitor 0.1F Al. Spacers - 0.5" 6-32 Hex Nut Optional: 16 Pin DIP Socket 16 Pin SOIC Socket Maxcap 1F 5.5V Signal Diode Pin Receptacle-Male 3137-3002-10-0080 216-3340-00-0602 216-7383-55-1902 LC055105A 3M-Textool 3M-Textool Cesiwid Inc. Generic Mill-Max Mfg. U1 U2 CBATT D1 1 1 1 1 26 8414 Part Number SP691ACN 300-1150-1472-7040 Manufacturer Sipex Mil-Max Mfg. Generic Keystone Elec. Generic C1, 2 Ref. Des. U3 Qty. 1 26 2 4 4
SP691AEB/03
SP691A/693A Evaluation Board Manual
(c) Copyright 2000 Sipex Corporation
5
SP691A/693A Evaluation Board Schematic
SP691AEB/03
SP691A/693A Evaluation Board Manual
(c) Copyright 2000 Sipex Corporation
6
ORDERING INFORMATION
Model Package SP691ANEB ....................................................................................................... SP691ACN Evaluation Board
Corporation
SIGNAL PROCESSING EXCELLENCE
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
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. SP691AEB/03 SP691A/693A Evaluation Board Manual (c) Copyright 2000 Sipex Corporation
7

▲Up To Search▲

Price & Availability of SP691ANEB

	To Download SP691ANEB Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .