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G771 Datasheet(PDF) 4 Page - Global Mixed-mode Technology Inc

Part No. G771
Description  Two Remote Temperature Sensors with SMBus Serial Interface and System Reset Circuit
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Maker  GMT [Global Mixed-mode Technology Inc]
Homepage  http://www.gmt.com.tw
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G771 Datasheet(HTML) 4 Page - Global Mixed-mode Technology Inc

 
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Ver 0.2 Preliminary
Dec 11, 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G771
Global Mixed-mode Technology Inc.
Electrical Characteristics (continued)
(VCC =full range, TA= 60°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Reset Threshold
VTH
4.2
4.4
4.5
V
Reset Active Timeout Period
340
ms
Output Voltage Low
VOL
VCC=VTH min ISINK =3.2mA
0.4
V
RESET
Output Voltage High
VOH
VCC>VTH max, ISOURCE =5.0mA VCC-1.5
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.
Note 3: A remote diode is any diode-connected transistor from Table1. TR is the junction temperature of the re-
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
RESET Output remains low while VCC is below the reset threshold, and for 240ms after VCC rises
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.


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