Rainbow-electronics LM85 Bedienungsanleitung PDF herunterladen (Seite 15)

Functional Description (Continued)

4.11 Registers 44-4Dh: Voltage Limit Registers

Address

Read/

Write

Name

Bit 7

(MSB)

Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

(LSB)

Default

Value

44h R/W 2.5V Low Limit 7 6543210 00h

45h R/W 2.5V High Limit 7 6543210 FFh

46h R/W V

CCP

Low Limit 7 6543210 00h

47h R/W V

CCP

High Limit 7 6543210 FFh

48h R/W 3.3V Low Limit 7 6543210 00h

49h R/W 3.3V High Limit 7 6543210 FFh

4Ah R/W 5V Low Limit 7 6543210 00h

4Bh R/W 5V High Limit 7 6543210 FFh

4Ch R/W 12V Low Limit 7 6543210 00h

4Dh R/W 12V High Limit 7 6543210 FFh

If a voltage input either exceeds the value set in the voltage high limit register or falls below the value set in the voltage low limit

register, the corresponding bit will be set automatically by the LM85 in the interrupt status registers (41-42h). Voltages are

presented in the registers at

⁄

full scale for the nominal voltage, meaning that at nominal voltage, each input will be C0h, as

shown in Table 2.

Setting the Ready/Lock/Start/Override register Lock bit has no effect on these registers.

TABLE 2. Voltage Limits vs Register Setting

Input Nominal

Voltage

Nominal Voltage

Maximum

Voltage

Maximum Voltage

Minimum

Voltage

Minimum Voltage

2.5V 2.5V C0h 3.32V FFh 0V 00h

CCP

2.25V C0h 3.00V FFh 0V 00h

3.3V 3.3V C0h 4.38V FFh 3.0V AFh

5V 5.0V C0h 6.64V FFh 0V 00h

12V 12.0V C0h 16.00V FFh 0V 00h

4.12 Registers 4E-53h: Temperature Limit Registers

Address

Read/

Write

Name

Bit 7

(MSB)

Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

(LSB)

Default

Value

4Eh R/W Processor (Zone1)

Low Temp

7 6543210 81h

4Fh R/W Processor (Zone1)

High Temp

7 6543210 7Fh

50h R/W Processor (Zone2)

Low Temp

7 6543210 81h

51h R/W Processor (Zone2)

High Temp

7 6543210 7Fh

52h R/W Processor (Zone3)

Low Temp

7 6543210 81h

53h R/W Processor (Zone3)

High Temp

7 6543210 7Fh

If an external temperature input or the internal temperature sensor either exceeds the value set in the corresponding high limit

register or falls below the value set in the corresponding low limit register, the corresponding bit will be set automatically by the

LM85 in the Interrupt Status Register 1 (41h). For example, if the temperature read from the Remote1− and Remote1+ inputs

exceeds the Processor (Zone1) High Temp register limit setting, Interrupt Status Register 1 ZN1 bit will be set. The temperature

limits in these registers are represented as 8 bit, 2’s complement, signed numbers in Celsius, as shown below in Table 3.

Setting the Ready/Lock/Start/Override register Lock bit has no effect on these registers.

LM85

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