STWBC2-HP datasheet(18/96 Pages) STMICROELECTRONICS

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2.1.7

LED/buzzer driver

LED/buzzer driver is a VDD (3.6 V/5 V) digital IO or current source that can be driven by a pattern generator from

the digital section (see Section 2.2.6 ). The frequency of pattern generator output is in the range of Hz for LED

and kHz for buzzer. The pattern generator can be bypassed for a direct driving of the pin (GPIO mode).

The digital driver can be configured in open drain modes. The current source current value can be configured.

Figure 23. LED/buzzer driver

Table 13. LED/buzzer driver operating parameters

Parameter

Value

Comment

Driver mode

HiZ, push-pull, open drain high-side, open drain low-side, current source

Input mode

Yes, pad state readable in register

Operating voltage

3.6 V/5 V

Digital IO drive current

20 mA for LED with 0.5 V driver drop

Optionally, 50 mA for buzzer with 0.5 V driver drop

VCC=5 V

Constant current sink

Configurable at 2.5 mA, 5 mA, 7.5 mA, 10 mA

2.1.8

USB detection

The USB detection circuit allows the biasing and signaling of DP and DM USB pins. Using this circuit in

combination with an adequate FW that uses ADC measurement on DP and DM, it is possible to detect the

connection of:

•

Basic downstream ports (USB simple host)

•

Downstream ports with charging capabilities as per USB BC 1.2 specification

•

Dedicated chargers as per USB BC 1.2 specification

•

Other manufacturer specific chargers

The detection circuit integrates two independent voltage sources driving DP and DM pins with up to 1mA current

capability. The voltage can be either 0.6 V, 2.8 V or 3.3 V. Optionally, a 15 kohms resistor can be enabled in series

with the voltage source.

STWBC2-HP

Analog AFE functions

DS13825 - Rev 1.0

page 18/96

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