STA680 datasheet(20/43 Pages) STMICROELECTRONICS

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I/O description

STA680

20/43

3.4

I/Os supply groups

The STA680 I/O signals are arranged into three different supply groups: Generic IO supply,

Flash IO supply and SDRAM IO supply group (see Table 2).

In the LQFP package option all three groups must be supplied with 3.3 V.

In the LFBGA package the three supply groups can independently operate at 3.3 V or 1.8 V.

●

The SDRAM_IO supply group must always be supplied at 3.3 V.

●

The MODEOP_GEN pin selects the operating voltage of the Generic_IO supply group.

If the it is shorted to ground then all the I/O signals belonging to the Generic_IO supply

group will work at 1.8 V; if the MODEOP_GEN pin is left floating or it is tied high (3.3 V)

all the group I/Os will operate at 3.3 V.

●

The MODEOP_FSH pin selects the operating voltage of the Flash_IO supply group. If

the it is shorted to ground then all the I/O signals belonging to the Flash_IO supply

group will work at 1.8 V; if the MODEOP_FSH pin is left floating or it is tied high (3.3 V)

the Flash Interface I/Os will operate at 3.3 V.

K4, L4

VDD_REG3.3 V

power

3.3 V

LDO

Supply

Input power supply for voltage

regulator at 3.3 Volt

N1, N2 VDD_REG1.8 V

power

1.8 V

LDO

Supply

Output power supply from voltage

regulator at 1.8 Volt

Table 2.

Pins description (continued)

Pin #

Ball #

Signal name

Type

Electrical

Supply

group

Description

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