Analog Devices EVAL-ADuM4138EBZ, Руководство пользователя

Страница: 11 / 18

EVAL-ADuM4138EBZ User Guide UG-1194
Rev. 0 | Page 11 of 18
162
45-
0
1
0
Figure 10. Address Bits Are Being Read Back
EXAMPLE EEPROM WRITE
To write data to the EEPROM, the Sim_Trim bit must first be
set. Set this bit by selecting 1 in the
Sim Trim field, and clicking
Write/Read Addr:10 . This setting results in the Sim_Trim
green indicator lighting up (see Figure 11).
When the Sim_Trim bit is set to 1, write commands to Address 00
or Address 01 affect the operation of the
ADuM4138 .
The next step to programming the EEPROM is to set the
desired bits in Address 00 and Address 01. In this example, Bit 0
of the
GAIN_1
field is set to 1. When it is set to 1, clicking
Write/Read Addr:00 results in the Addr:00 Output field
showing that the value was written to the register. At this time,
the GAIN_1 EEPROM register is not yet programmed. Note
that
Sim_Trim is still 1 (see Figure 12).
To write Address 00 data to EEPROM, set the Prog Busy field
to 1, and click
Write/Read Addr:10
(see Figure 13).
The write/read button performs a write and then a read as
normal. The
Prog_Busy green indicator is usually lit up. This
state is because the read command occurs quickly after the
write, and the Prog_Busy bit in the
ADuM4138 is 1 while the
device is being programmed. Click Read Addr:10 after this
programming, and once the Prog_Busy bit changes to 0, the
EEPROM is programmed. The programming takes approximately
10 μs; therefore, a human user generally cannot click the read
button fast enough to see a 1 in the
Prog Busy field the second
time, but an automated program might (see Figure 14).