MAX1358B Maxim Integrated Products, MAX1358B Datasheet - Page 29

• Manufacturer Part Number: MAX1358B
• Description: Data-Acquisition System
• Manufacturer: Maxim Integrated Products

DataSheet.in
Figure 5. Linear-Regulator Block Diagram
The MAX1358B provides voltage supervisors to monitor
DV
DV
sponding LDVD status bit when DV
1.8V threshold voltage. When the DV
rises above the threshold during power-up, RESET
deasserts after a nominal 1.5s timeout period to give the
crystal oscillator time to stabilize. Set the threshold hys-
teresis using the HYSE bit of the PS_VMONS register.
See the PS_VMONS Register section for configuring hys-
teresis. There is no separate voltage monitor for AV
but the analog supply is covered by the DV
many applications where DV
connected together. Multiple supply applications where
AV
separate external voltage monitor for AV
for a block diagram of the DV
The second voltage monitor tracks the charge-pump
output voltage, CPOUT. If CPOUT falls below the 2.7V
threshold, a corresponding register status bit (LCPD) is
16-Bit, Data-Acquisition System with ADC, DACs,
DV
UPIOs, RTC, Voltage Monitors, and Temp Sensor
DD
DD
DD
DD
supply voltage. RESET asserts and sets the corre-
and DV
and CPOUT. The first supervisor monitors the
LINEAR 1.65V VOLTAGE REGULATOR
LDOE
1.22V
DD
are not connected together require a
______________________________________________________________________________________
OP
LDOE
DD
DD
Voltage Supervisors
voltage supervisor.
and AV
DD
DD
1.65V
DD
DD
falls below the
supply voltage
. See Figure 7
DD
are externally
monitor in
REG
DD
,
set to flag the condition. The CPOUT monitor output
can also be mapped to the interrupt generator and out-
put on INT. The CPOUT monitor can be used as a 3V
AV
disabled and CPOUT is connected to AV
must be greater or equal to DV
to monitor AV
CPOUT voltage supervisor.
The interrupt generator provides an interrupt to an
external µC. The source of the interrupt is generated by
the status register and can be masked and unmasked
through the IMSK register. CRDY is unmasked by
default, and INT is active-high at power-on reset. INT is
programmable as active-high and active-low. Possible
sources include a rising or falling edge of UPIO_, an
RTC alarm, an ADC conversion completion, or the volt-
age-supervisor outputs. The interrupt causes INT to
assert when configured as an interrupt output.
Figure 6. Charge-Pump Block Diagram
REG
DD
monitor in applications where the charge pump is
M32K
DD.
CLOCK GENERATOR
See Figure 8 for a block diagram of the
NONOVERLAP
CPE
Interrupt Generator (INT)
CHARGE-PUMP DOUBLER
DD
when CPOUT is used
DD
CPOUT
CF-
CF+
. AV
DD
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