4 Pin Failure Mode Analysis (Pin FMA)

This section provides a failure mode analysis (FMA) for the pins of the TPS3842-Q1. 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-Q1 pin diagram. For a detailed description of the device pins please refer to the Pin Configuration and Functions section of the TPS3842-Q1 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.