CC3200

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SWAS032F – JULY 2013 – REVISED FEBRUARY 2015

(9) Device firmware automatically enables the digital path during ROM boot.

(10) Pin 45 is used by an internal DC-DC (ANA2_DCDC) and pin 52 is used by the RTC XTAL oscillator. These modules use automatic configuration sensing. Therefore, some board-level

configuration is required to use pin 45 and pin 52 as digital pads (see Figure 3-2). Because the CC3200R device does not require ANA2_DCDC, the pin can always be used for digital

functions. However, pin 47 must be shorted to the supply input. Typically, pin 52 is used for RTC XTAL in most applications. However, in some applications a 32.768-kHz square-wave

clock might always be available onboard. In such cases, the XTAL can be removed to free up pin 52 for digital functions. The external clock must then be applied at pin 51. For the chip to

automatically detect this configuration, a 100K pull-up resistor must be connected between pin 52 and the supply line. To prevent false detection, TI recommends using pin 52 for output-

only functions.

(13) This pin is shared by the ADC inputs and digital I/O pad cells. Important: The ADC inputs are tolerant up to 1.8 V. On the other hand, the digital pads can tolerate up to 3.6 V. Hence,

care must be taken to prevent accidental damage to the ADC inputs. TI recommends that the output buffer(s) of the digital I/Os corresponding to the desired ADC channel be disabled first

(that is, converted to high-impedance state), and thereafter the respective pass switches (S7, S8, S9, S10) should be enabled (see Section 3.2, Drive Strength and Reset States for

Analog-Digital Multiplexed Pins).

(14) Requires user configuration to enable the ADC channel analog switch. (The switch is off by default.) The digital I/O is always connected and must be made Hi-Z before enabling the ADC

switch.

Figure 3-2. Board Configuration to Use Pins 45 and 52 as Digital Signals

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Terminal Configuration and Functions

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