zl2005 Intersil Corporation, zl2005 Datasheet - Page 36

• Manufacturer Part Number: zl2005
• Description: Digital-dc? Integrated Power Management And Conversion Ic
• Manufacturer: Intersil Corporation

2N3904 or equivalent. Figure 18 illustrates the typical
connections required.
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.
Figure 18. External Temperature Monitoring
ZL2005
Embedded Thermal Diode
ZL2005
Discrete NPN
XTEMP
SGND
XTEMP
SGND
36
2N3904
FPGA
ASIC
DSP
µP
ZL2005
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 accessible by the user as follows:
1. Default Store: A power supply module manufac-
2. User Store: The manufacturer of a piece of equip-
Please refer to Application Note AN13 for details on
how to set specific security measures via the I
SMBus interface.
turer may want to protect the module from damage
by preventing the user from being able to modify
certain values that are related to the physical con-
struction 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 setting but would restrict the user from
restoring the device to the factory setting.
ment may want to provide the ability to modify
certain power supply settings while still protecting
the equipment from modifying values that can
lead to a system level fault. The equipment manu-
facturer would use the User Store to achieve this
goal.
February 18, 2009
FN6848.0
2
C/