Ver 0.2 Preliminary

Dec 11, 2001

TEL: 886-3-5788833

http://www.gmt.com.tw

4

G771

Global Mixed-mode Technology Inc.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX UNITS

Reset Threshold

4.2

4.4

4.5

V

Reset Active Timeout Period

340

ms

Output Voltage Low

0.4

V

RESET

Output Voltage High

V

Note 1: Guaranteed but not 100% tested.

Note 2: Quantization error is not included in specifications for temperature accuracy. For example, if the G771

device temperature is exactly +66.7°C, or +68°C (due to the quantization error plus the +1/2°C offset

used for rounding up) and still be within the guaranteed ±3°C error limits for the +60°C to +100°C tem-

perature range. See Table3.

mote diode. See Remote Diode Selection for remote diode forward voltage requirements.

Note 4: The SMBus logic block is a static design that works with clock frequencies down to DC. While slow op-

eration is possible, it violates the 10kHz minimum clock frequency and SMBus specifications, and may

monopolize the bus.

Note 5: Note that a transition must internally provide at least a hold time in order to bridge the undefined region

(300ns max) of SMBCLK's falling edge.

Pin Description

PIN

NAME

FUNCTION

1,6,10,13,15

NC

Not connected.

2

Vcc

Supply Voltage Input, 4.5V to 5.5V. Bypass to GND with a 0.1µF capacitor.

3

DXP1

Combined Current Source and A/D Positive Input for remote-diode channel 1. Do not leave DXP1

floating; tie DXP1 to DXN if no remote diode on channel 1 is used. Place a 2200pF capacitor be-

tween DXP1 and DXN for noise filtering.

4

DXN

Combined Current Sink and A/D Negative Input. DXN is common negative node of both remote di-

odes on channel 1 and 2. The traces of DXP1-DXN and DXP2-DXN pairs should be routed inde-

pendently. The common DXN should be connected together as close as possible to the IC. DXN is

internally connected to the GND pin for signal ground use.

5

DXP2

Combined Current Source and A/D Positive Input for remote-diode channel 2. Do not leave DXP2

floating; tie DXP2 to DXN if no remote diode on channel 2 is used. Place a 2200pF capacitor be-

tween DXP2 and DXN for noise filtering.

7

DGND

Digital Ground.

8

AGND

Analog Ground.

9

RESET

above the reset threshold.

11

ALERT

SMBus Alert (interrupt) Output, open drain.

12

SMBDATA SMBus Serial-Data Input / Output, open drain.

14

SMBCLK

SMBus Serial-Clock Input.

16

TH_SHUT Thermal Shutdown Output, push-pull output.