MAX11358B datasheet(42/70 Pages) MAXIM

Part #	MAX11358B

Description	16-Bit Data-Acquisition System with ADC, DAC, UPIOs, RTC, Voltage Monitors, and Temp Sensor

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Manufacturer	MAXIM [Maxim Integrated Products]

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

UPIOs, RTC, Voltage Monitors, and Temp Sensor

42

______________________________________________________________________________________

NOMINAL

THRESHOLD (mV)

TSEL2

TSEL1

TSEL0

00

X

50

100

1

0

1

150

1

0

200

1

Table 11. Setting the Signal-Detect

Comparator Threshold

X = Don’t care.

The REF_SDC register contains bits to control the refer-

ence voltage and signal-detect comparator.

REFV<1:0>: Reference buffer voltage gain and enable

bits. Enables the output buffer, and sets the gain and

the voltage at the REF pin as shown in Table 10. Power-

on state is off to enable an external reference to drive

the REF pin without contention.

AOFF: ADC and DAC/op-amp power-off bit. This bit pro-

vides a method for turning off several analog functions

with a single write. Setting AOFF = 1 deasserts the

ADCE in the ADC register and the DAE, DBE, and OP1E

bits in the DACA_OP and DACB_OP registers, powering

down these analog blocks. Setting AOFF = 0 has no

effect. The AON bit has priority when both AON and

AOFF bits are asserted.

Most of the analog functions can be disabled with a

single write to the REF_SDC register by using AOFF,

REFV<1:0>, and SDCE.

AON: ADC and DAC/op-amp power-on bit. This bit pro-

vides a method of turning on several analog functions

with a single write. Setting AON = 1 asserts the ADCE

bit in the ADC register and DAE, DBE, and OP1E bits in

the DACA_OP and DACB_OP register, powering up

these blocks. Setting AON = 0 has no effect. The AON

bit has priority when both AON and AOFF bits are

asserted.

Most of the analog functions can be enabled with a sin-

gle write to the REF_SDC register using AON,

REFV<1:0>, and SDCE.

SDCE: Signal-detect comparator power-enable bit. Set

SDCE = 1 to power up the signal-detect comparator,

and set SDCE = 0 to power down the signal-detect

comparator. The ADCE bit in the ADC register must be

set to 1 to use the signal-detect comparator.

TSEL<2:0>: Threshold-select bits. These bits select the

threshold for the signal-detect comparator as shown in

Table 11.

MSB

LSB

REFV1

REFV0

AOFF

AON

SDCE

TSEL2

TSEL1

TSEL0

REF_SDC Register (Power-On State: 0000 0000)

REFERENCE

BUFFER GAIN

(V/V)

REF OUTPUT

VOLTAGE (V)

REFV1

REFV0

Disabled

Off (High

Impedance

at REF)

00

1.0

1.25

0

1

1.638

2.048

1

0

2.0

2.5

1

Table 10. Setting the Reference Output

Voltage

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