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SA56004FD Datasheet(PDF) 6 Page - NXP Semiconductors |
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SA56004FD Datasheet(HTML) 6 Page - NXP Semiconductors |
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6 / 36 page  SA56004X_5 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 05 — 22 May 2008 6 of 36 NXP Semiconductors SA56004X Digital temperature sensor with overtemperature alarms 7.4 Power-on reset When power is applied to the SA56004X, the device will enter into its Power-On Reset (POR) state and its registers are reset to their default values. The configuration, status, and temperature-reading registers remain in these states until after the first conversion. As shown in Table 4 this results in: 1. Command register set to 00h. 2. Local Temperature register (LTHB and LTLB) set to 0 °C. 3. Remote Diode Temperature register (RTHB and RTLB) set to 0 °C until the end of the first conversion. 4. Status register (SR) set to 00h. 5. Configuration register (CON) set to 00h; interrupt latches are cleared, the ALERT and T_CRIT output drivers are off and the ALERT and T_CRIT pins are pulled HIGH by the external pull-up resistors. 6. Local T_CRIT temperature setpoints (LCS) and Remote T_CRIT temperature setpoints (RCS) at 85 °C. 7. Local HIGH setpoint (LHS) and remote HIGH temperature setpoint (RHSHB) at 70 °C. Table 4. Register assignments Register name Command byte POR state Function Bits Access Read address Write address LTHB 00h n/a 0000 0000 local temperature high byte 8 R RTHB 01h n/a 0000 0000 remote temperature high byte 8 R SR 02h n/a 0000 0000 status register 8 R CON 03h 09h 0000 0000 configuration register 8 R/W CR 04h 0Ah 1000 conversion rate 4 R/W LHS 05h 0Bh 0100 0110 local high setpoint 8 R/W LLS 06h 0Ch 0000 0000 local low setpoint 8 R/W RHSHB 07h 0Dh 0100 0110 remote high setpoint high byte 8 R/W RLSHB 08h 0Eh 0000 0000 remote low setpoint high byte 8 R/W One Shot n/a 0Fh - writing register initiates a one shot conversion 0 W RTLB 10h n/a 0000 00 remote temperature low byte 6 (MSBs) R RTOHB 11h 11h 0000 0000 remote temperature offset high byte 8 R/W RTOLB 12h 12h 000 remote temperature offset low byte 3 (MSBs) R/W RHSLB 13h 13h 000 remote high setpoint low byte 3 (MSBs) R/W RLSLB 14h 14h 000 remote low setpoint low byte 3 (MSBs) R/W RCS 19h 19h 0101 0101 remote T_CRIT setpoint 8 R/W LCS 20h 20h 0101 0101 local T_CRIT setpoint 8 R/W TH 21h 21h 0 1010 T_CRIT hysteresis 5 R/W ATLB 22h n/a 0000 0000 local temperature low byte 3 (MSBs) R AM BFh BFh 0 Alert mode 1 R/W RMID FEh n/a 1010 0001 read manufacturer’s ID 8 R RDR FFh n/a 0000 0000 read stepping or die revision 8 R |
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