STLED316S datasheet(11/33 Pages) STMICROELECTRONICS

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STLED316S

STLED316S functional description

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3.4

Display types

Table 3.

Seven segment display with dot point and common-anode LED panel

3.5

Keyscan

The full keyscan is illustrated in the another section of the datasheet. One diode is required

per key switch. The keyscan circuit detects any combination of keys being pressed.

3.6

Discrete LED outputs

The STLED316S can be used to drive up to 8 discrete LEDs. The single LED output acts

like a digit driver output and can be wired-up with 8 segment outputs to drive up to 8 different

discrete LEDs. Physical connections from the LED output as well as the segment outputs

must be made to drive the discrete LEDs in the desired manner. The discrete LEDs may be

needed to indicate the “Power”, “Standby” status (for example). Also it is possible to

separately control the brightness of each single LED.

3.7

Power on reset and soft-start

The device integrates an internal power-on-reset circuit which initializes the digital logic

upon power up. The soft-start circuit limits the inrush current and high peak current during

power-up. This is done by delaying the input circuit’s response to the external applied

voltage. During soft-start, the input resistance is higher which lowers the in-rush current

when the supply voltage is applied.

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