ST92F150-EVAL STMicroelectronics, ST92F150-EVAL Datasheet - Page 9

• Manufacturer Part Number: ST92F150-EVAL
• Description: BOARD EVALUATION FOR ST9 SERIES
• Manufacturer: STMicroelectronics

Specifications of ST92F150-EVAL

• Processor To Be Evaluated: ST90158 and ST92F1x Daughter Board
• Interface Type: I2C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-2905

EVALUATION BOARD GETTING STARTED
– EPROM: segments 0x00 and 0x01.
– Flash: segments 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E and 0x0F.
– RAM: segments, 0x24 and 0x25.
For segment definitions, refer to any ST9 datasheet.
The comparator (74HC688) is used to select the memories. When the ST92F150-TQFP64
daughter board is used, the 5 Most Significant Address Bits A[15:11] must be connected di-
rectly on the board to a High or a Low level by hardware as port P1 is limited to P1[2:0].
When using a low voltage power supply (i.e. less than 4.5 V) the memories used by the moth-
erboard must be replaced as follows:
– Replace M27C1001 (5 V ± 10%) with M27V101 (3 to 3.6 V),
– Replace M29F040B (5 V ± 10%) with M29W040B (2.7 to 3.6 V),
– Replace M48Z128Y (5 V ± 10%) with M48Z128V (2.8 to 4.6 V).
Note: M27V101, M29W040B and M48Z128V are not supplied.
2.2.7 I²C Interface
An external EEPROM and a remote 8-bit I/O expander (PCF8574) connected to a 7 segment
display can both be accessed via an I²C bus.
The EEPROM address is 0101 000R/W in binary, where R/W is a single bit that is set to 1 in
order to read the EEPROM, and reset to zero in order to write to the EEPROM. Connector
TP20 is use to protect the EEPROM in write mode.
The address of the remote 7-segment display is 0x07. When the application is running with a
3.5 V power supply, a jumper must be installed in connector TP21 in order to increase the
lighting level of the display. This jumper must be removed when using a supply voltage greater
than 3.5 V.
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