SimCom SIM800L - I2 C Bus

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SIM800L(MT6261)_Hardware Design_V1.01 42 2016-07-07

KBRx

KBCx

20K

<1K

Module

Figure 39: Keypad reference circuit

Whether using a 5*5 keys or 5*5*2 keys, the module can also detect the two buttons pressed. But when using a

5*5*2 button, the same row, column two buttons pressed at the same time can’t be detected, as shown below:

KBRx

KBCx

20K

Module

Figure 40: Keypad detected

Table 22: Pin definition of the keypad interface

Pin name Pin number Function Default state

KBC0 20

Keypad matrix column

Pull up

KBC1 25 Pull up

KBC2 22 Pull up

KBC3 21 Pull up

KBC4

Pull up

KBR0 62

Keypad matrix row

Pull down

KBR1 60 Pull down

KBR2 61 Pull down

KBR3 23 Pull down

KBR4

Pull down

Note: Please be sure to increase the ESD protection devices in product design phase, and make sure have ESD protection devices

in the final product.

4.11. I2C Bus

The SIM800L provides an I2C interface which is only used in the embedded AT application.

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