MAX11358B Datasheet, PDF(29/70 Page) Maxim Integrated Products – 16-Bit Data-Acquisition System with ADC, DAC, UPIOs, RTC, Voltage Monitors, and Temp Sensor

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MAX11358B Datasheet, PDF (29/70 Pages) Maxim Integrated Products – 16-Bit Data-Acquisition System with ADC, DAC, UPIOs, RTC, Voltage Monitors, and Temp Sensor

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16-Bit Data-Acquisition System with ADC, DAC,

UPIOs, RTC, Voltage Monitors, and Temp Sensor

DVDD

1.22V

LDOE

1.65V

REG

M32K

REG

CPE

NONOVERLAP

CLOCK GENERATOR

CPOUT

CF+

CF-

LDOE

LINEAR 1.65V VOLTAGE REGULATOR

Figure 5. Linear-Regulator Block Diagram

CHARGE-PUMP DOUBLER

Figure 6. Charge-Pump Block Diagram

Voltage Supervisors

The MAX11358B provides voltage supervisors to monitor

DVDD and CPOUT. The first supervisor monitors the

DVDD supply voltage. RESET asserts and sets the corre-

sponding LDVD status bit when DVDD falls below the

1.8V threshold voltage. When the DVDD supply voltage

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 AVDD,

but the analog supply is covered by the DVDD monitor in

many applications where DVDD and AVDD are externally

connected together. Multiple supply applications where

AVDD and DVDD are not connected together require a

separate external voltage monitor for AVDD. See Figure 7

for a block diagram of the DVDD voltage supervisor.

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

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

AVDD monitor in applications where the charge pump is

disabled and CPOUT is connected to AVDD. AVDD

must be greater or equal to DVDD when CPOUT is used

to monitor AVDD. See Figure 8 for a block diagram of the

CPOUT voltage supervisor.

Interrupt Generator (INT)

The interrupt generator provides an interrupt to an

external ÂµC. 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.

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