ST EVALSPEAr320HMI, User Manual, Page: 15 / 36

EVALSPEAr320HMI Block descriptions and configurations
Doc ID 18410 Rev 3 15/36
4.6 Power supply
There are two ways to supply power to the SPEAr320 HMI evaluation board:
●
Connect the +5 V voltage adapter (included in the EVALSPEAr320HMI package) to the
J11 power voltage connector on the CPU board.
● Connect a 7 to 30 V DC power source (not included in the EVALSPEAr320HMI
package) to either connector CN900 or connector CN901 on the expansion board.
The input voltage is connected to the DC/DC converter, U900 (either L7986A or L5973A,
see
Table 9 ).
The board is protected against overvoltage by the D903 Transil diode (SM6T33A), and
against possible reverse polarity voltage (from an incorrect power plug-in) by the D902
Schottky diode (STPS3L40U).
See also: Power supply connectors (CN900 and CN901) on page 24
4.7 Dual interface EEPROM (U702)
The expansion board has 64-Kbit EEPROM memory (M24LR64) with password protection
and dual interface.
The M24LR64-R device is a dual-access, electrically erasable programmable memory
(EEPROM) that features an I2C interface, and can be operated from a VCC power supply. It
is a contactless memory, powered by the received 13.56 MHz carrier electromagnetic wave.
The M24LR64-R is organized as 8192 × 8 bits in the I2C mode, and as 2048 × 32 bits in the
ISO 15693 and ISO 18000-3 mode 1 RF mode.
4.8 NAND flash memory (U100)
The expansion board has a 4-Gbit (512Mx8bit with spare 16Mx8 bit) NAND flash memory
device supplied from the 3.3V domain. This memory has a x8 interface, and is divided into
blocks that can be erased independently; it is possible to preserve desired data while
erasing data that is no longer of interest.
The device contains 4096 blocks, composed of 64 pages.
Table 9. U900 DC/DC converter jumpers
Jumper Description Configuration
JP900
Disconnects the +5V delivered from the DC/DC converter U900.
Default: installed
JP901 (3-pin resistor)
Install to use L7986A (Default)
Install to use L5973A
JP902 (3-pin resistor)
Install to use L7986A (Default)
Install to use L5973A
1 2 3
1 2 3
1 2 3
1 2 3
1 2 3
www.BDTIC.com/ST