User's Manual

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Laird Technologies

BTM510/511

Bluetooth

Multimedia Module

3. Mic Input Gain

A microphone preamplier which adds extra 24dB to input gain, is controlled by S-Register 415.

The microphone amplier is enabled by ATS415=1 and disabled by ATS415=0. Refer to Table 3.43.

The rst amplier in Figure 3.28 represents the microphone preamplier and the second amplier

represents the analogue component of the programmable audio input gain (refer to Table 3.40).

Figure3.28:ADCAnalogueAmplierBlockDiagram

4. LED Control

The module provides two dedicated output pins for LEDs (LED0, LED1). The following modes are

supported: LED_OFF, LED_ON, LED_PWM and LED_PULSE.

In LED_PWM mode, the parameters “Duty Cycle” an “PWM Period” can be specied via S-Registers.

This enables either to dim the brightness of an LED (PWM Period=0) or to specify blinking with dened

on-time in a dened period (PWM Period > blinking visible for the eye).

In LED_PULSE mode, the brightness of an LED is modulated. Modulation speed is dened by parameter

“Pulse Rate” and maximum brightness is dened by parameter “Duty Cycle”.

Task AT-Command / SRegister Comment

Set LED 0 mode S335 [0..3], default=0 Mode:

0 = LED_OFF

1 = LED_ON

2 = LED_PWM

3 = LED_PULSE

Set LED 1 mode S340 [0..3], default=0

Set LED 0 Duty Cycle S336 [0..4095], default = 2048 referenced if LED mode =

LED_PWM or LED_PULSE

Set LED 1 Duty Cycle S341 [0..4095], default = 2048

Set LED 0 PWM Period S337 [0..15], default = 0 referenced if LED mode =

LED_PWM

Set LED 1 PWM Period S342 [0..15], default = 0

Set LED 0 Pulse Rate S338 [0..15], default = 0 referenced if LED mode =

LED_PULSE

Set LED 1 Pulse Rate S343 [0..15], default = 0

Table 3.42: LED S-Registers

5. Hardware Units - S Registers

Table 3.43 below gives an overview on S Registers for hardware units except GPIO. For GPIO Registers

please refer to Table 3.45.

AT COMMAND SET

REFERENCE