LM8300HVA9 National Semiconductor, LM8300HVA9 Datasheet - Page 15
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LM8300HVA9
Manufacturer Part Number
LM8300HVA9
Description
IC TOUCHSCREEN CONTROLLER 44PLCC
Manufacturer
National Semiconductor
Type
Resistiver
Datasheet
1.LM8300HVA9.pdf
(20 pages)
Specifications of LM8300HVA9
Touch Panel Interface
4-Wire
Number Of Inputs/keys
1 TSC
Resolution (bits)
10 b
Data Interface
UART
Data Rate/sampling Rate (sps, Bps)
38.4k
Voltage - Supply
2.7 V ~ 5.5 V
Current - Supply
11.5mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
44-PLCC
Voltage Supply Source
Single Supply
For Use With
LM8300-REF-01 - BOARD EVALUATION LM8300
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Sampling Rate (per Second)
-
Other names
*LM8300HVA9
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM8300HVA9
Manufacturer:
Texas Instruments
Quantity:
10 000
13.0 Brownout Reset
The internal reset will not be turned off until t
to zero. The internal reset will perform the same functions as
external reset. The device is guaranteed to operate at the
specified frequency down to the specified brownout voltage.
After the underflow, the logic is designed such that no addi-
tional internal resets occur as long as V
the brownout voltage.
The device is relatively immune to short duration negative
going V
power supply voltage is essential for proper brownout func-
tionality. Power supply decoupling is vital even in battery
powered systems.
There are two optional brownout voltages. The part numbers
for the two versions of this device are:
LM8500, V
LM8300, V
Refer to the device specifications for the actual V
ages.
High brownout voltage devices are guaranteed to operate at
10MHz down to the high brownout voltage. Low brownout
voltage devices are guaranteed to operate at 3.33MHz down
to the low brownout voltage. Low brownout voltage devices
are not guaranteed to operate at 10MHz down to the low
brownout voltage.
Under no circumstances should the RESET pin be allowed
to float. The RESET input may be connected to an external
pull-up resistor to V
output of the brownout reset detector will always preset t
CC
bor
bor
transients (glitches). Proper filtering of the V
= high voltage range.
= low voltage range.
CC
or to other external circuitry. The
(Continued)
CC
FIGURE 4. Brownout Reset Operation
remains above
id
counts down
bor
volt-
id
CC
to
15
a value between 120-128µs for the LM8500 and 360-384µs
for the LM8300. At this time, the internal reset will be gener-
ated.
The device has a built in watchdog monitoring module to
prevent runaway code. To use the watchdog feature, the
WD_OUT pin must be connected to the RESET pin. The
WD_OUT pin has an internal weak pull-up so that, when the
WD_OUT pin is connected to the RESET pin, the RESET pin
does not require an external pull-up resistor to V
14.0 Calibration
The device supports two, five, and thirteen point calibration.
If desired, the calibration points can be stored internally in
the non-volatile storage element. During calibration time, the
device has the unique ability to check if the calibration points
make sense. For instance, if the desired calibration point
was to be at the upper left hand corner, but by accident, the
actual point detected was at the lower right hand corner, the
device will reject this point. This ensures the calibration
process is not performed incorrectly.
The calibration checking, can be enabled or disabled. If the
calibration checking is enabled, the controller will always
check the current calibration point being done against the
theoretical point and determine if the value is within
the raw A/D values. If this option is desired, the touch screen
driver must perform the calibration according to the calibra-
tion mapping for the two, five, and thirteen points as shown
in Figure 5, Figure 6, and Figure 7, respectively. The theo-
retical values for the two, five, and thirteen points are shown
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