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DS1680 Datasheet(PDF) 2 Page - Dallas Semiconductor

Part No. DS1680
Description  Portable System Controller with Touch-Screen Control
Download  23 Pages
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Maker  DALLAS [Dallas Semiconductor]
Homepage  http://www.dalsemi.com
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DS1680 Datasheet(HTML) 2 Page - Dallas Semiconductor

 
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DS1680
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Automatic backup and write protection of an external SRAM is provided through the VCCO and
CEO pins. The backup energy source used to power the RTC is also used to retain RAM data in the
absence of VCC through the VCCO pin. The chip-enable output to SRAM, CE0 , is controlled during power
transients to prevent data corruption.
The DS1680’s microprocessor- monitor circuitry provides three basic functions. First, a precision
temperature-compensated reference and comparator circuit monitors the status of VCC. When an out-of-
tolerance condition occurs, an internal power-fail signal is generated that forces
RST to the active state.
When VCC returns to an in- tolerance condition, the RST signal is kept in the active state for tRPU to allow
the power supply and processor to stabilize. The DS1680 debounces a pus hbutton input and guarantees an
active RST pulse width of tRST . The third function is a watchdog timer. The DS1680’s internal timer
forces the RST signal to the active state if the strobe input is not driven low prior to watchdog time-out.
The DS1680 also provides a touch-screen controller along with a 10-bit successive approximation ADC.
The ADC is monotonic (no missing codes) and has an internal analog filter to reduce high frequency
noise.
DS1680 BLOCK DIAGRAM Figure 1
CLOCK
OSC
CLOCK
GEN
PANEL
DRIVE
CONVERT
CONTROL
10-BIT
ADC
INPUT
MUX
TOUCH
DETECT
POWER
CONTROL
RTC
SERIAL
INTERFACE
WATCHDOG
OUTPUT
MUX
BHE
OUT_SELECT
PEN_SELECT
AIN0
AIN1
COEN
CONVERT
PEN_OFF
PD_RST
D0-D7
OSCIN
X1
X2
INT
SCLK
CS
I/O
ST
RST
POWER SWITCH,
WRITE PROTECT,
NV CONTROL,
AND
POWER FAIL
WARNING
VCC
VBAT
VCCO
CEI
CEO
PFI
PFO
ANSELIN
X+
X-
Y+
Y-
NEW_DATA


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