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SA56004BDP Datasheet(PDF) 10 Page - NXP Semiconductors |
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SA56004BDP Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 23 page  Philips Semiconductors Product data sheet SA56004X ±1 °C accurate, SMBus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms 2004 Oct 06 10 FUNCTIONAL DESCRIPTION Serial bus interface The SA56004X should be connected to a compatible two-wire serial interface System Management Bus (SMBus) as a slave device using the two device terminals SCLK and SDATA. The ALERT pin can optionally be used with the SMBus protocol to implement the ARA response. The controller will provide a clock signal to the device SCLK pin and write/read data to/from the device through the device SDATA pin. External pull-up resistors, about 10 k Ω each, are needed for these device pins due to open drain circuitry. Data of 8-bit digital byte or word are used for communication between the controller and the device using SMBus 2.0 protocols which are described more in the ‘SMBus Interface’ section on page 17. The operation of the device to the bus is described with details in the following sections. Slave address The SA56004X has a 7-bit slave address register which is factory programmed in OTP memory. Eight unique devices are available with different slave addresses as defined in the ‘Ordering information’ section in Table 1, ‘Device slave address options’. Up to eight devices can reside on the same SMBus without conflict, provided that their addresses are unique. Register overview The SA56004X contains three types of SMBus addressable registers. These are read only (R), write only (W), and read-write (R/W). Attempting to write to any R-only register or read data from any W-only register will produce an invalid result. Some of the R/W registers have separate addresses for reading and writing operations. The registers of the SA56004X serve four purposes: • Control and configuration of the SA56004X • Status reporting • Temperature measurement storage • ID and manufacturer test registers. Table 2 describes the names, addresses, power-on-reset (POR), and functions of each register. The data of the temperature-related registers is in 2’s complement format in which the MSB is the sign bit. The 8-bit data of other registers is in 8-bit straight format. Table 2. Register assignments REGISTER NAME COMMAND BYTE POR STATE FUNCTION BITS ACCESSIBILITY NAME READ ADDRESS WRITE ADDRESS STATE LTHB 00h NA 0000 0000 Local Temperature HIGH Byte 8 R RTHB 01h NA 0000 0000 Remote Temperature HIGH Byte 8 R SR 02h NA 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 NA 0Fh Writing register initiate a one shot conversion 0 W RTLB 10h NA 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 RLocal T_CRIT Setpoint 8 R/W TH 21h 21h 0 1010 T_CRIT Hysteresis 5 R/W LTLB 22h NA 0000 0000 Local Temperature Low Byte 3(MSBs) R AM BFh BFh 0 Alert Mode 1 R/W RMID FEh NA 1010 0001 Read Manufacturer’s ID 8 R RDR FFh NA 0000 0000 Read Stepping or Die Revision 8 R |
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