33199

VCC

REF-IN-L

REF-IN-K

LO

RXD

TXD

NC

REF-OUT

VS

L

I1

GND

DIA

NC

1

2

3

4

5

6

7

14

13

12

11

10

9

8

Analog Integrated Circuit Device Data

Freescale Semiconductor

3

33199

PIN CONNECTIONS

PIN CONNECTIONS

Figure 3. 33199 Pin Connections

Table 1. Pin Definitions

A functional description of each pin can be found in the Functional Pin Description section, beginning on page 12.

Pin Number

Pin Name

Definition

1

VCC

5V typical power supply pin. typical supply current is less than 1.5mA

2

REF-IN-L

Input reference for C2 comparator.

3

REF-IN-K

Input reference for C1 comparator.

4

LO

This pin control Sleep Mode, Transmit Level, and Speed. It has a weak pulldown.

5

RXD

Open drain output of the data on BUS. A recessive bus = a logic [1], a dominant bus = logic [0]. An

external pullup is required.

6

TXD

Data input here will appear on the BUS pin. A logic [0] will assert the bus, a logic [1] will make the bus

go to the recessive state.

7, 8

NC

No internal connection to these pins.

9

DIA

Provides a battery-level logic signal.

10

GND

Electrical Common Ground and Heat removal. A good thermal path will also reduce the die

temperature.

11

I1

Power input. An external diode is needed for reverse battery protection.

12

L

The external bus load resistor connects here to prevent bus pullup in the event of loss of module

ground.

13

VS

This pin connects to the bus through external components.

14

REF-OUT

Internal reference voltage generator output pin.