PC87591L datasheet(185/437 Pages) NSC

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Embedded Controller Modules (Continued)

Revision 1.07

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Voltage Channel 3 Control Register (VCHN3CTL)

This register controls the operation and indicates the status of Voltage Channel 3. VCHN3CTL is set to 1F16 on reset.

Location: 00 FF3C16

Type: Varies per bit

Voltage Channel 3 Data Buffer (VCHN3DAT)

This register (buffer) holds the data measured by Voltage Channel 3.

Location: 00 FF3E16

Type: RO

4.11.7 Usage Hints

Power Supply and Layout Guidelines

For more information, see Section 3.1.3 on page 63.

Power Consumption

ADC power consumption from the analog supply (AVCC) is practically zero if the ADC is disabled by setting ADCEN in

ADCCNF register to 0.

When the ADC is enabled, the current consumption depends on the channel type measured (voltage or temperature) and

the ADC clock frequency. To minimize current consumption, disable the ADC when not in use. See details in “Enabling and

Disabling the ADC” on page 174.

Back-Drive Protection

To maintain the high performance of the analog circuits, AD(0-7), AD8/DP and AD9/DN pins are not back-drive protected.

Therefore, the voltage applied to these pins must be within the AGND to AVCC range; otherwise, the device may be dam-

aged. External circuits should not drive currents into these pins when the PC87591x is not powered up.

Measuring Out of Range Voltages

The ADC is capable of measuring positive input voltages from 0V to VFS. Input voltages outside this range should either be

divided or level-shifted, as required.

Bit

76543210

Name

DATVAL

CSCALE

INTDVEN

SELIN

Reset

00011111

Bit

Type

Description

4-0

R/W

SELIN (Selected Input). Same as Voltage Channel 1.

R/W

INTDVEN (Interrupt from Data Valid Enable). Same as Voltage Channel 1.

R/W

CSCALE (Channel Scale). Same as Voltage Channel 1.

R/W1C DATVAL (Data Valid). Same as Voltage Channel 1.

Bit

9876543210

Name

Reserved

VCHDAT

Bit

Description

9-0

VCHDAT (Voltage Channel 3 Data). Same as Voltage Channel 1.

15-10 Reserved.

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