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參數(shù)資料
| 型號(hào)： | MAX1755 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | SOT23 Local Temperature Comparators with SMBus Serial Interface |
| 中文描述： | SOT23封裝本地溫度比較器，帶有SMBus串行接口 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 294K |
| 代理商： | MAX1755 |
M
Chip Information
TRANSISTOR COUNT: 2963
SOT23 Local Temperature Comparators
with SMBus Serial Interface
10
______________________________________________________________________________________
TOP VIEW
SMBDATA
SMBCLK
1
6
GND
5
V
CC
ADD
MAX1755
SOT23
2
3
4
OVERT
SMBDATA
SMBCLK
1
6
GND
5
V
CC
ADD
MAX1756
SOT23
2
3
4
ALERT
Pin Configurations
Listing 1. Measuring Temperature by Successive Approximation
/* Use successive approximation to measure the ambient temperature.
** Returns the measured temperature in degrees C.
**
** global variables:
** __int8 shadow_command contains the last command we wrote
** __int8 shadow_status contains the last status value we read
**
** External functions:
** SMBusSendByte(__int8 address, __int8 command);
** SMBusReceiveByte(__int8 address, __int8* received_data);
** Delay_msec(int delay_time_msec);
*/
int MeasureTemperature()
{
/* Write a test temperature, then read the status byte.
** Use the state of the OVER bit to determine each successive bit.
*/
signed __int8 Thi = 127; /*upper limit starts at maximum */
signed __int8 Tlo = -128; /*lower limit starts at minimum */
while ( (Thi - Tlo) > 0 ) {
signed __int8 Ttest = (Thi + Tlo) / 2; /* guess between Thi and Tlo */
SMBusSendByte(address, Ttest); /* set new threshold */
shadow_command = Ttest;
Delay_msec(SAR_delay_time);
SMBusReceiveByte(address, &shadow_status); /* get status byte */
if (shadow_status & 0x80) { /* over temperature */
if (Tlo == Ttest)
break; /* close enough, exit loop */
Tlo = Ttest; /* move lower limit up */
} else { /* not over temperature */
if (Thi == Ttest)
break; /* close enough, exit loop */
Thi = Ttest; /* move upper limit down */
}
}
return Ttest*2; /* temperature in degrees C = twice the threshold number */
}
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