DEMO MANUAL DC1562B
LTC699X-X
TimerBlox: Oscillators, One Shots,
PWM, Delay, Power on Reset
Description
Demonstration circuit 1562B is an engineering tool to
design and evaluate the LTC699X-X family of TimerBlox
®
circuits. The center section of the board contains a pre-
configured TimerBlox function. DC1562B comes in twelve
timing function variations as outlined in Table 1.
Surrounding the center board is a playground prototyping
area. The prototyping area has pads for DIP-8, S8, MS8,
or S6 packages with bread boarding connections to each
pin and two convenient power buses and ground bus
surrounding the entire area. This area is for conditioning
signals to control the timer function and for adding loads
controlled in time.
The center part of the board can be detached as a stream-
lined circuit, to combine with a pre-existing circuit. For
application flexibility, a provision is made for buffering and
inverting the output of the timer. An optional NC7W04P6X
SC70 package dual inverter can be added at U2 to provide
this functionality.
Design files for this circuit board are available at
http://www.linear.com/demo
L,
LT, LTC, LTM, Linear Technology, TimerBlox and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Using the Demo BoarD
To understand the simplicity and flexibility of the TimerBlox
function, download the appropriate data sheet from the LTC
website,
www.linear.com.
Each evaluation board comes
with a TimerBlox part, decoupling cap and a bulk decou-
pling 10µF tantalum cap. Resistors are also installed that
configure the TimerBlox device so that they are ready to use
by simply adding power. Changing the default configura-
tion of the demo board is a simple matter of determining
a few new resistor values. Simply select a pair of resistor
values for the DIV value from the data sheet DIV table,
calculate the value of R
SET
required, replace the resistor
on the board, apply power, and go! Single supply power
between 2.25V and 5.5V and ground must be supplied
directly to the center board.
The outer prototyping section of the board can be used
with single or dual supplies as required.
When using the
prototyping area, the outermost trace, which is ground,
must be connected (hand wired) to the ground on the
center board section.
All input and output holes are sized
for 65mil turret terminals, or wires can be soldered in the
holes directly.
Changing the timer configuration requires changing re-
sistor values on the center board. The resistor lead holes
can accept “pressed-in” DIP sockets, or resistors can
be soldered directly in the holes. Pads for 0805 surface
mount resistors are also included at each position where
a leaded resistor could be used. Pads are also included
for three 25-turn trim pots which can be used to replace
R
SET
(R8) for master oscillator frequency adjustment, PSF
in (R10) for voltage controlled options, and R
DEV
(R7) for
frequency divider control to permit real-time adjustments
while running.
dc1562bfa
1
DEMO MANUAL DC1562B
Using the Demo BoarD
Table 1. Standard Configuration for Each Version
DEMO BOARD
NUMBER
DC1562B-A
DC1562B-B
DC1562B-C
DC1562B-D
DC1562B-E
DC1562B-F
DC1562B-G
DC1562B-H
DC1562B-I
DC1562B-J
DC1562B-K
DC1562B-L
DC1562B-M
DC1562B-N
LTC PART NUMBER
LTC6990
LTC6991
LTC6992-1
LTC6992-2
LTC6992-3
LTC6992-4
LTC6993-1
LTC6993-2
LTC6993-3
LTC6993-4
LTC6994-1
LTC6994-2
LTC6995-1
LTC6995-2
PART MARKING FUNCTION
LTDWW
LTDWY
LTDXB
LTDXD
LTFCQ
LTFCS
LTDXG
LTDXJ
LTFMH
LTFMK
LTFCV
LTFCX
LTGJN
LTGJQ
HF OSC
LF OSC
PWM
PWM
PWM
PWM
One-Shot
One-Shot
One-Shot
One-Shot
Delay
Delay
POR
POR
CONFIGURED FUNCTION
1kHz to 10kHz Voltage Controlled Oscillator
1Hz (1Sec) Fixed Frequency Oscillator
10kHz 0% to 100% Duty Cycle PWM
10kHz 5% to 95% Duty Cycle PWM
10kHz 0% to 95% Duty Cycle PWM
10kHz 5% to 100% Duty Cycle PWM
RET* 100ms Positive Output Pulse
RET* Retriggerable 100ms Positive Output Pulse
FET** Positive 100ms Output Pulse
FET** Retriggerable 100ms Positive Output Pulse
Output Falling Edge Delayed 100ms from Input Falling Edge
Output Rise/Fall Edges Delayed 100ms from Input Rise/Fall Edges
1sec Power on Reset
1sec Power on Reset
* Rising Edge Triggered
** Falling Edge Triggered
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dc1562bfa
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