ADP5140WACCZ-R7 datasheet(40/128 Pages) AD

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ADP5140

Data Sheet

Rev. 0 | Page 40 of 128

Table 27. MODE Pin Setting

RMODE (kΩ)

Debug Mode

Device Index

VIO (V)

12.1

Enable

1.8

15.0

Enable

3.3

19.1

Enable

1.8

23.7

Enable

3.3

29.4

Disable

1.8

36.5

Disable

3.3

45.3

Disable

1.8

57.6

Disable

3.3

73.2

Enable

1.8

90.9

Enable

3.3

118

Enable

1.8

147

Enable

3.3

182

Disable

1.8

237

Disable

3.3

309

Disable

1.8

464

Disable

3.3

The debug function enables or disables debug mode. When in

debug mode, all faults related to watchdogs are ignored.

The device index setting function sets the device index for the

ADP5140. Four device indexes can be set with different

resistance between the MODE pin and ground. See the SPI

section for more information.

Use the I/O voltage selection function to select the I/O voltage.

The ADP5140 supports a 1.8 V or 3.3 V I/O supply voltage.

An SPI register, MODE_PIN_STATUS, records the MODE pin

configuration and is readable through the SPI.

VIO SUPPLY

VIO provides the power supply for the digital interface on the

ADP5140. The VIO pin supports a voltage of either 3.3 V or

1.8 V, and the resistance between the MODE pin and ground

determines which voltage is supported.

The VIO pin has a UVLO monitoring circuit. If VIO is below

the VIO UVLO threshold, an input and output UVLO fault

event occurs. The ADP5140 sets the VIO_UVLO_STATUS bit

in the UV_STATUS register and the VIO_UVLO_LATCH bit

in the UV_LATCH register.

WAKE-UP FUNCTION AND EXTERNAL EVENT

DETECTION

The WAKE pin supports either the wake-up function or the

external event detection function, depending on the configuration

in the WAKEPIN_EVT SPI register. The WAKE pin default

setting is the wake-up function.

When configured for the wake-up function, a low voltage level on

the WAKE pin wakes up the ADP5140 and the device exits

standby mode (see the Standby Mode section for more

information). The wake-up function is effective only in

standby mode.

When configured for the external event detection function, a

low voltage level with a duration time longer than the deglitch

time (tD_WAKE) on the WAKE pin sets a latch event in the

ADP5140. This latch event is reflected on the RESET, STATUS,

or FAULT pin depending on the SPI settings.

An internal 1 MΩ pull-down resistor keeps the voltage on the

WAKE pin below the WAKE low voltage threshold (see Table 1)

when the WAKE pin is left floating.

WATCHDOG

The ADP5140 integrates two window watchdogs, Watchdog 0

(WD0) and Watchdog 1 (WD1), and one QA watchdog

(QA_WD). WD0 and WD1 are fed through the WDI0 pin and

WDI1 pin. QA_WD is fed through the SPI, which detects the

software fault of the processor.

Window Watchdog

There are three trigger modes that feed each window watchdog

from the WDIx pin: rising edge trigger, falling edge trigger, or both

rising and falling edge trigger, as shown in Figure 83, Figure 84,

and Figure 85, respectively. The WDTx_TRIG_EDGE_SEL bits

in the WDTx_CTRL register determine the trigger mode for

the window watchdog.

Table 28. Window Watchdog Trigger Edge Configuration

WDTx_TRIG_EDGE_SEL, Bits[1:0]

Trigger Edge

Both edges

01 (Default)

Rising edge

Falling edge

Both edge

TIME

WINDOW

OPEN

WINDOW

tWDx_FAST

VWDIx

tWDx_SLOW

Figure 83. Rising Edge Signal Triggers WDx

VWDIx

TIME

WINDOW

OPEN

WINDOW

tWDx_FAST

tWDx_SLOW

Figure 84. Falling Edge Signal Triggers WDx

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