L9803 STMicroelectronics, L9803 Datasheet - Page 72

• Manufacturer Part Number: L9803
• Description: Super Smart Power Motor Driver With 8-bit Mcu, Ram, Eeprom, Adc, Wdg, Timers, Pwm And H-bridge Driver
• Manufacturer: STMicroelectronics

On-Chip Peripherals
Note:
5.5.7
72/126
T0 = 0143h = 323K (50 Celsius)
VTo = 015Ch = 348 LSB (conversion of 1.7V, sensor output)
and the sensor output is 2V, converted by the ADC in code 0110011001 = 019Ah = 410LSB,
the temperature of the chip is
TEMP = 019Ah * 0143h / 015Ch = 017Ch
equivalent to:
TEMP = 410 * 323 / 348 = 380 K = 107 °C
The sensor circuit may have two kind of error: one translating its output characteristic up
and down and the other changing its slope. The described trimming recovers only the
translation errors but can not recover slope error. After trimming, being T
temperature, the specified precision can be achieved in the range T
150
Register Description
CONTROL/STATUS REGISTER (ADCCSR)
Address: 0072h — Read/Write
Reset Value: 0010 0000 (20h)
Bit 7,6 = Reserved
Bit 5 =COCO (Read Only) Conversion Complete
COCO is set (by the ADC) as soon as a conversion is completed (results can be read).
COCO is cleared by setting ADST=1 (start of new conversion). If COCO=0 a conversion is
running, if COCO=1 no conversion is running.
Bit 4 = ADIE A/D Interrupt Enable
This bit is used to enable / disable the interrupt function:
0: interrupt disabled
1: interrupt enabled
Bit 3= Reserved
Bit 2= ADST Start Conversion
When this bit is set a new conversion starts. ADST is automatically reset when the
conversion is completed (COCO=1).
Bits 1-0 = CH1-CH0 Channel Selection
These bits select the analog input to convert. See
7
0
°
C]. Precision is related to the read temperature in Kelvin.
0
COCO
ADIE
0
Table 12
ADST
for reference.
TRIM
CH1
-80, max[T
TRIM
the trimming
TRIM
CH0
0
L9803
+80,