CS5535 datasheet(546/555 Pages) NSC

546 / 555 page

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546

Revision 0.8

Electrical Specifications (Continued)

6.3.11 Miscellaneous Signals

The “recommended use” for GPIO3 and GPIO4 is DDC

support signals DDC_SCL and DDC_SDA, because these

two GPIOs have a high drive capacity, open-drain output.

They use an “SMB” buffer type. The 32 kHZ clock output is

a mux option on GPIO27 and uses a “Q7” buffer. For a

detailed explanation of buffer types, see Table 2-4 "Buffer

Type Characteristics" on page 28.

In this subsection, unless otherwise noted:

• All timing specifications are specified under the oper-

ating conditions listed in Table 6-3 on page 526 (i.e.,

VCORE and VCORE_VSB = All; VIO and VIO_VSB = All;

TCASE = All).

• Signals are referenced to KHZ32_XCI high-to-low edge.

• Signal parameters are defined in Figure 6-2 "AC Refer-

ence Timing and Test Definition" on page 530.

Table 6-19. Miscellaneous Signals Except UART Timing Parameters

Signal

Parameter

Min

Max

Units

Comment/Condition

DDC_SCL (GPIO3)

DDC_SDA (GPIO4)

See Section 6.3.13 "GPIO Signaling"

on page 548.

32KHZ (GPIO27)

tVAL

Note 1 and Note 2.

Note 1. tVAL min times with load of: 10 pF cap to ground.

tVAL max times with load of: 50 pF cap to ground.

Note 2. GPIO27 configured: AUX_IN and Input Enable = 0; Output Enable and AUX_OUT_2 = 1; Open-drain and

AUX_OUT_1 = 0.

CS5535 Datasheet(PDF) 546 Page - National Semiconductor (TI)