BL652-SC datasheet(39/69 Pages) LSTD

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BL652

Datasheet

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An I2C interface allows multiple masters and slaves to communicate over a shared wired-OR type bus consisting

of two lines which normally sit at VCC. The BL652 module can only be configured as an I2C master with additional

constraint that it be the only master on the bus. The SCL is the clock line which is always sourced by the master

and SDA is a bi-directional data line which can be driven by any device on the bus.

IMPORTANT:

It is essential to remember that pull-up resistors on both SCL and SDA lines are not provided in

the module and MUST be provided external to the module.

Table 22: I2C interface

Signal Name

Pin No

I/O

Comments

I2C_SDA

I/O

This interface is an alternate function on each pin, configurable by

smartBASIC. I2COPEN() in smartBASIC selects I2C function.

I2C_SCL

I/O

General Purpose I/O, ADC, PWM and FREQ

5.9.1 GPIO

The 19 SIO pins are configurable by smartBASIC. They can be accessed individually. Each has the following user

configured features:



Input/output direction



Output drive strength (standard drive 0.5 mA or high drive 5mA)



Internal pull-up and pull-down resistors (13 K typical) or no pull-up/down



Wake-up from high or low level triggers on all pins including NFC pins

5.9.2 ADC

The ADC is an alternate function on SIO pins, configurable by smartBASIC.

The BL652 provides access to 8-channel 8/10/12-bit successive approximation ADC in one-shot mode. This

enables sampling up to 8 external signals through a front-end MUX. The ADC has configurable input and

reference pre-scaling and sample resolution (8, 10, and 12 bit).

5.9.2.1 Analog Interface (ADC)

Table 23: Analog interface

Signal Name

Pin No

I/O

Comments

AIN – Analog Input

This interface is an alternate function on each pin, configurable by

smartBASIC. AIN configuration selected using GpioSetFunc()

function.

Configurable 8, 10, 12 bit resolution.

Configurable voltage scaling 4, 2, 1/1, 1/3, 1/3, 1/4, 1/5,

1/6(default).

Configurable acquisition time 3uS, 5uS, 10uS(default), 15uS, 20uS,

40uS.

Full scale input range (VCC)

AIN – Analog Input

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