DRV8308_15 Datasheet, PDF (35/60 Pages) Texas Instruments – DRV8308 Brushless DC Motor Controller

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Device Functional Modes (continued)
DRV8308
SLVSCF7A – FEBRUARY 2014 – REVISED OCTOBER 2014
fHALL_U
AA_SETPT
B
A
A/B
fCLKIN
AG_SETPT
B
A
A/B
ADVANCE
LOOPGAIN
AUTOADV
X
1
0
LOCK
AUTOGAIN
X
1
0
Latch
To Commutation
Counter
Latch
To Loop Gain
Multiplier
Figure 21. Auto Gain and Advance Functions
8.4.3 External EEPROM Mode
A serial EEPROM can be connected to the serial port to load the register contents. To activate external
EEPROM mode, connect the SMODE terminal to logic high. This causes the SPI interface to act as a master,
and load data from an external EEPROM. The DRV8308 device latches data on the falling edge of SCLK.
The serial EEPROM should be a microwire-compatible, 16-bit-word device, such as the 93C46B. The VREG
power supply can be used to power the EEPROM. Connections are as shown in Figure 22:
Microwire Serial EEPROM
93C46B or Equivalent
10 k
VCC
CS
DI
DO
CLK
VSS
VREG
SDATAO
SCS
SDATAI
SPI
SCLK
SMODE
Figure 22. EEPROM Mode Connections
Data in the EEPROM should be arranged starting at address 0 exactly as shown in Table 6. EEPROM data bits
12 to 15 are unused.
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