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SA56004FD Datasheet(PDF) 5 Page - NXP Semiconductors |
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SA56004FD Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 36 page  SA56004X_5 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 05 — 22 May 2008 5 of 36 NXP Semiconductors SA56004X Digital temperature sensor with overtemperature alarms 7. Functional description Refer to Figure 1 “Block diagram”. 7.1 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 Section 7.10 “SMBus interface”. The operation of the device to the bus is described with details in the following sections. 7.2 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 Table 2 “Ordering options”. Up to eight devices can reside on the same SMBus without conflict, provided that their addresses are unique. 7.3 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 4 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. |
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