ADUC7036 Datasheet, PDF (34/140 Pages) Analog Devices – Integrated Precision Battery Sensor for Automotive

ADuC7036
ADUC7036 KERNEL
The ADuC7036 features an on-chip kernel resident in the top 2
kB of the Flash/EE code space. After any reset event, this kernel
copies the factory calibrated data from the manufacturing data
space into the various on-chip peripherals. The peripherals
calibrated by the kernel are as follows:
• Power supply monitor (PSM)
• Precision oscillator
• Low power oscillator
• REG_AVDD/REG_DVDD
• Low power voltage reference
• Normal mode voltage reference
• Current ADC (offset and gain)
• Voltage/temperature ADC (offset and gain)
User MMRs that can be modified by the kernel and differ from
their POR default values are as follows:
• R0 to R15
• GP0CON/GP2CON
• SYSCHK
• ADCMDE/ADC0CON
• FEE0ADR/FEE0CON/FEE0SIG
• HVDAT/HVCON
• HVCFG0/HVCFG1
• T3LD
Preliminary Technical Data
The ADuC7036 also features an on-chip LIN downloader.
A flow chart of the execution of the kernel is shown in Figure 15.
The current revision of the kernel can be derived from SYSSER1,
as described in Table 99.
After a POR reset, the watchdog timer is disabled once the
kernel code is exited. For the duration of the kernel execution,
the watchdog timer is active with a timeout period of 500 ms.
This ensures that when an error occurs in the kernel, the
ADuC7036 automatically resets. After any other reset, the
watchdog timer maintains user code configuration for the
period of the kernel, and is refreshed just prior to kernel exit. A
minimum watchdog period of 30 ms is required to allow correct
LIN downloader operation. If LIN download mode is entered,
the watchdog is periodically refreshed.
Normal kernel execution time, excluding LIN download, is
approximately 5 ms. It is only possible to enter and leave LIN
download mode through a reset.
SRAM is not modified during normal kernel execution; rather,
SRAM is modified during a LIN download kernel execution.
Note that even with NTRST = 0, user code is not executed unless
Address 0x14 contains either 0x27011970 or the checksum of
Page 0, excluding Address 0x14. If Address 0x14 does not contain
this information, user code is not executed and LIN download
mode is entered. During kernel execution, JTAG access is
disabled.
With NTRST = 1, user code is always executed.
Rev. PrA | Page 34 of 140