ISL8271MEVAL1Z datasheet(20/57 Pages) RENESAS

20 / 57 page

ISL8271M

FN8636 Rev.4.00

Page 20 of 57

Aug 17, 2017

Fault Spreading

Digital DC modules and devices can be configured to broadcast a

fault event over the DDC bus to the other devices in the group

with the PMBus command DDC_GROUP. When a non-destructive

fault occurs and the device is configured to shut down on a fault,

the device shuts down and broadcasts the fault event over the

DDC bus. The other devices on the DDC bus shut down

simultaneously (if configured to do so) and attempt to restart in

their prescribed order.

Temperature Monitoring Using XTEMP Pin

The ISL8271M supports measurement of an external device

temperature using either a thermal diode integrated in a

processor, FPGA or ASIC, or using a discrete diode-connected

2N3904 NPN transistor. Figure 29 illustrates the typical

connections required. The external temperature sensors can be

used to provide the temperature reading for over-temperature

and under-temperature faults. These options for the external

temperature sensors are enabled using the USER_CONFIG

PMBus command.

Monitoring Using SMBus

A system controller can monitor a wide variety of ISL8271M system

parameters using PMBus commands:

•READ_VIN

•READ_VOUT

•READ_IOUT

• READ_TEMPERATURE_1

• READ_TEMPERATURE_2

• READ_DUTY_CYCLE

• READ_FREQEUNCY

•MFR_READ_VMON

Snapshot Parameter Capture

The ISL8271M offers a feature to capture parametric data and

some fault status after a fault. A detailed description is provided in

“SNAPSHOT (EAh)” on page 47 and “SNAPSHOT_CONTROL (F3h)”

on page 47.

Nonvolatile Memory

The ISL8271M has internal nonvolatile memory that stores user

configurations. Integrated security measures ensure that the

user can restore the module only to a level that has been made

available to them. During the initialization process, the

ISL8271M checks for stored values contained in its internal

non-volatile memory.

Modules are shipped with factory defaults configuration and

most settings can be overwritten with PMBus commands and

can be stored in nonvolatile memory with the PMBus command

STORE_USER_ALL.

FIGURE 29. EXTERNAL TEMPERATURE MONITORING

XTEMP+

XTEMP-

XTEMP+

XTEMP-

ISL8271M

2N3904

µP

FPGA

DSP

ASIC

DISCRETE NPN

EMBEDDED THERMAL DIODE

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