LM8322 datasheet(24/42 Pages) NSC

Part #	LM8322

Description	Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface

PDF	42 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

Logo

24 / 42 page

15.0 Digital Multiplexers

Two 2:1 multiplexers are provided for host-controlled digital

switching. Setting the MUX1EN or MUX2EN bits with the

WRITE_CFG command enables the corresponding multi-

plexer and its input and output signals, which overrides any

other functions which may use these pins. The MUX1 signals

are alternate functions of the PWM_x outputs. The MUX2

signals are alternate functions of three KP-Yx pins.

The data select inputs for the multiplexers are controlled by

the MUX1SEL and MUX2SEL bits, which are written by the

WRITE_CFG command. If it is important to avoid momentarily

passing an incorrect input to the output, the select bit must be

loaded with a first WRITE_CFG command before sending a

second WRITE_CFG command to set the enable bit. The

truth table for the multiplexers is shown in Table 9.

TABLE 9. Digital Multiplexer Function Table

MUXxE

N Bit

MUXxSEL

Bit

MUXx_IN

MUXx_OU

not enabled

LM8322 Datasheet(PDF) 24 Page - National Semiconductor (TI)