4 Pin Failure Mode Analysis (Pin FMA)

This section provides a failure mode analysis (FMA) for the pins of the TPS3842. The failure modes covered in this document include the typical pin-by-pin failure scenarios:

• Pin short-circuited to ground (see Table 4-2)
• Pin open-circuited (see Table 4-3)
• Pin short-circuited to an adjacent pin (see Table 4-4)
• Pin short-circuited to supply (see Table 4-5)

Table 4-2 through Table 4-5 also indicate how these pin conditions can affect the device as per the failure effects classification in Table 4-1.

Figure 4-1 shows the TPS3842 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section of the TPS3842 data sheet.

Following are the assumptions of use and the device configuration assumed for the pin FMA in this section:

• At V_{DD (MIN)} ≤ VDD ≤ V_{DD (MAX)}
• CTS = Open, CTR = Open
• Output reset pullup resistor (R_PULLUP) = 10kΩ, output reset pullup voltage (V_PULLUP = 3.3V)
• Sense is monitoring VDD
• Typical values are at T_A = 25°C, V_DD = 3.3V, C_VDD= 0.1µF, and V_ITN = 0.7V; unless stated otherwise.