Specifications

L506 Hardware Design

Figure 3-25boot configuration and force USB download recommended circuit

3.14 Analog and Digital conversion (ADC) interface

L506 integrated two analog-to-digital conversion interface, specific parameters are as follows:

Table 3-24 ADC1, ADC2 characters

characters

Min.

Typ.

Max.

Unit

ADCresolution

Bits

Transfer time

442

Input voltage range

0.1

1.7

Input resistance

MΩ

Note: 1. use "AT + CADC" and "AT + CADC2" can read ADC1 and ADC2 voltage on the pin.

More information please refer to the document [1].

2. The need for special software version to support access to the ADC.

3.15 I2C interface

3.15.1 I2C pin definition

I2C is used to communicate with peripheral equipment and can be operated as either a transmitter or

receiver, depending on the device function. Both SDA and SCL are bidirectional lines connected with

I2C interface. Its operation voltage is 1.8V. High speed mode transmission rate can reach 400 KBPS,

Because L506 have internal pulled up to the I2C interface, so in your design needn’t pull up. Figure

3-26 is the reference design:

L506

1.8V

BOOT_CFG0

10K

BOOT_CFG0

COEX2/FORCE_USB_BOOT

SW3

SW1

SW2