MIC7400_15 Datasheet, PDF (50/68 Pages) Micrel Semiconductor – Configurable PMIC, Five-Channel Buck Regulator Plus One-Boost with HyperLight Load® and I2C Control

Micrel, Inc.
MIC7400
EEPROM-Ready Register (01’h)
This register indicates the status of EEPROM to external I²C host.
The READY bit = 1 when the Trim and Configuration data have been loaded into core from EEPROM after reset, reboot
or reload and the chip is ready for operation. [If the SAVE1 bit in register 04’h is read in as logic 1, the configuration
registers will not be loaded from the EEPROM memory and the READY bit will still get set indicating that any startup
procedure involving the EEPROM memory is complete.] The READY bit will be set to 1 after loading or attempting to load
Trim and Configuration data from EEPROM into volatile memory. The Trim data will always be loaded and if SAVE1 bit in
register 04’h is set to logic 0, Configuration data is also loaded. Regardless of the SAVE1 bit being set or not, after the
loading operation the READY bit is set to 1.
The CONFIG bit = 1 when the Configuration data have been saved to EEPROM after the SAVECONFIG Code is issued
from the Host. If CONFIG=1 before the SAVECONFIG code is issued, CONFIG will be cleared immediately and then will
be set to logic 1 again once all Configuration data is written to the EEPROM memory.
The CALIB bit = 1 when the Trim data have been saved to EEPROM after the SAVETRIM Code is issued from the Host.
If CALIB=1 before the SAVETRIM code is issued, CALIB will be cleared immediately and then will be set to logic 1 again
once all Trim data is written to the EEPROM memory.
The EEPREAD and EEPWRITE bits indicate if an EEPROM read or write fault has occurred. These bits should be read
and cleared prior to reloading data from the EEPROM memory.
Table 6. EEPROM Status Register
Register Name
STATUS_REG
Address
Field
bit R/W Default
READY
0
R
0
CONFIG
1
R
0
CALIB
Reserved
Reserved
Reserved
EEPREAD
2
R
0
3 R/W
0
4 R/W
0
5 R/W
0
6 R/W
0
EEPWRITE
7 R/W
0
EEPROM Status Register
0x01’h
Description
Indicate ready for operation when the trim and configuration data has been loaded
0 = Data not loaded
1 = Chip Ready
Indicate Configuration saved to EEPROM
0 = Configuration not saved
1 = Configuration Saved
Indicate trim data have been saved to EEROM
0 = Trim not saved
1 = Trim saved
Not Used
Not Used
Not Used
EEPROM Read
0 = No Fault
1 = Fault
EEPROM Write
0 = No Fault
1 = Fault
March 3, 2015
50
Revision 2.0