STS1TX datasheet(53/70 Pages) STMICROELECTRONICS

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STS1TX

MCU interface

The only available analog output is the temperature sensor, see Section 8.8.

10.4

MCU clock

The STS1TX can directly provide the system clock to the MCU in order to avoid the need for

an additional crystal. The clock signals for the MCU can be available on the GPIO pins. The

source oscillator can be the internal RCO or the XO depending on the active state. When

XO is active, it is the source clock (the RCO is not available in this condition).

In addition, different ratios are available and programmable through the MCU_CK_CONF

configuration register, as described in Table 32.

Wakeup from external input (sensor output)

External clock @ 34.7 kHz (used for LDC modes timing)

From 5 to 31

Not used

Table 31. Digital inputs (continued)

I/O selection

Input signal

Table 32. MCU_CK_CONF configuration register

MCU_CK_CONF[4:0]

Clock source

Division ratio

XO_RATIO

RCO_RATIO

Don’t care

RCO

1/128

Don’t care

2/3

1/2

1/3

1/4

1/6

1/8

71/12

81/16

91/24

1/36

1/48

1/64

1/96

1/128

1/192

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