ZL2005 datasheet(36/39 Pages) RENESAS

36 / 39 page

ZL2005

FN6848 Rev 2.00

Page 36 of 39

February 23, 2011

Figure 18. External Temperature Monitoring

6.14 Fan Monitoring using the TACH Pin

The ZL2005 can monitor the tachometer pulse of an

external 3-wire fan connected to the TACH pin. The

device will report a revolutions per minute (RPM) value

assuming one pulse per revolution. The TACH pin is

only monitored when the device is enabled or when it is

configured to always be in monitoring mode. Refer to

Application Note AN13 for more details on configuring

specific operating modes.

6.15 Device Security Features

Note that the ZL2005 integrates several security mea-

sures to ensure that the user can only restore the device

to a level that has been made available to them. During

the initialization process, the ZL2005 checks for stored

values contained in its internal memory. The ZL2005

offers two internal memory storage units that are acces-

sible by the user as follows:

1. Default Store: A power supply module manufacturer

may want to protect the module from damage by

preventing the user from being able to modify cer-

tain values that are related to the physical construc-

tion of the module.

In this case, the module

manufacturer would use the Default Store and would

allow the user to restore the device to its default set-

ting but would restrict the user from restoring the

device to the factory setting.

2. User Store: The manufacturer of a piece of equip-

ment may want to provide the ability to modify cer-

tain power supply settings while still protecting the

equipment from modifying values that can lead to a

system level fault. The equipment manufacturer

would use the User Store to achieve this goal.

Please refer to Application Note AN13 for details on

how to set specific security measures via the I2C/SMBus

interface.

ZL2005

SGND

XTEMP

Discrete NPN

2N3904

ZL2005

SGND

XTEMP

Embedded Thermal Diode

µP

FPGA

DSP

ASIC

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