ZM7300G Series Digital Power Manager

Data Sheet

ZD-00896 Rev. 5.1, 13-Jul-10

www.power-one.com

Page 9 of 33

10.1.1 Write Protection

There are hardware-based and software-based memory write protections. The hardware protection

takes precedence over the software protection.

10.1.1.1

Hardware Protection

The LCK_N pin enables the hardware memory write protection. If the pin is pulled low, the hardware

error code (0x00). The write commands to the POL converters bypassing the DPM are also disabled. If

the pin is left floating, the hardware lock is disabled and the software write protection is active.

10.1.1.2

Software Protection

The software write protection allows users to protect the various memory blocks from being overwritten

The software write protection can be disabled by checking appropriate boxes in the Write Protections

are automatically restored when the DPM’s input power is recycled.

Figure 5. GUI Write Protections Window

10.1.2 DPM Registers

The DPM setup registers occupy 70 bytes and contain all necessary information to set up the DPM

functionality, define POL converters and Auxiliary Devices, group membership and behavior, margining,

interrupt configurations, etc.

of supporting up to 32 POL converters. For other DPM models some of the registers and/or bits in the

registers are not activated depending on the number of supported POLs/Groups/Interrupts/Parallel

Buses for the specific DPM. Writing into an unsupported register or bit will have no effect, reading from

an unsupported register or bit will return an error code (0x00).