Maxim Integrated │ 4

www.maximintegrated.com

Evaluate: MAX6884/MAX6885

MAX6884 Evaluation System/

Evaluation Kit

If an output is asserted, that output is also displayed in the

status bar.

RESET indicates that the RESET output has

been asserted.

UV/OV indicates that the UV/OV output

has been asserted.

WDO indicates that the watchdog

timer output has been asserted.

Voltage Monitor Tab

The

Voltage Monitor tab (Figure 1) configures volt-

age monitor thresholds and input impedance for the

MAX6884 IN1–IN6 inputs. Adjust the

Range dropdown,

“A” Primary Threshold, and “B” Secondary Threshold

controls until the desired thresholds are set.

Press the

Refresh button to read the current values from

the MAX6884. Press the

Apply button to send the soft-

ware value to the MAX6884.

Outputs Tab

The outputs of the MAX6884 are triggered by the logical

AND of the selected control inputs. Select the control

inputs from the

Output Configuration box (Figure 3).

Choose the output pin to modify from the

Programmable

Output Pin drop-down on the Outputs tab. Choose the

Output Type and De-glitch Timer Delay from the Output

Characteristics box.

Press the

Refresh button to read the current values from

the MAX6884. Press the

Apply button to send the soft-

ware values to the MAX6884.

Watchdog Timer Tab

A watchdog timer asserts a fault condition after a period

of time, unless the timer is periodically reset by the WDI

input pin being toggled. This fault register status is dis-

played in the status bar as

WDO. Configure the watchdog

timer settings from the

Watchdog Timer tab (Figure 4).

During normal operation, an enabled watchdog timer

must be serviced by toggling the WDI pin periodically

(

“A” timeout duration). Typically an external piece of

firmware services the watchdog timer by toggling the WDI

pin inside a loop, and watchdog timer assertion is config-

ured to drive an output pin. Any software defect that halts

the firmware then causes the watchdog timer to assert.

The initial timeout period (

“B” timeout duration) can be

set to a longer value to allow time for software initializa-

tion. Enable the watchdog timer by checking the

Enable

Watchdog Timer checkbox. The desired Output Type

can also be programmed.

Figure 3. MAX6884 EV Kit Software Outputs Tab