Datasheet

Analog Integrated Circuit Device Data
Freescale Semiconductor 31
10XSC425
6 Functional Device Operation
6.1 SPI Protocol Description
The SPI interface has a full duplex, three-wire synchronous data transfer with four I/O lines associated with it: Serial Input (SI),
Serial Output (SO), Serial Clock (SCLK), and Chip Select (
CSB).
The SI / SO pins of the 10XSC425 follow a first-in first-out (D15 to D0) protocol, with both input and output words transferring the
most significant bit (MSB) first. All inputs are compatible with 5.0 or 3.3
V CMOS logic levels.
Figure 10. Single 16-Bit Word SPI Communication
6.2 Operational Modes
The 10XSC425 has four operating modes: Sleep, Normal, Fail-Safe and Fault. Table 6 and Figure 12 summarize details
contained in succeeding paragraphs.
The Figure 11 describes an internal signal called IN_ON[x] depending on IN[x] input.
Figure 11. IN_ON[x] Internal Signal
The 10XSC425 transits to operating modes according to the following signals:
• wake-up = RSTB or WAKE or IN_ON[0] or IN_ON[1] or IN_ON[2] or IN_ON[3],
• fail = (V
DD
Failure and VDD_FAIL_en) or (Watchdog timeout and FSI input not shorted to ground),
• fault = OC[0:3] or OT[0:3] or SC[0:3] or UV or (OV and OV_dis).
CS
CSB
SI
SCLK
SO
D15
D1 D2 D3 D4 D5 D6 D7 D8 D9 D14
D13
D12
D11
D10
OD12
D0
OD13
OD14
OD15
OD6OD7OD8OD9OD10OD11
OD1
OD2
OD3
OD4OD5
1. RSTB is in a logic H state during the above operation.
2. DO, D1, D2, ... , and D15 relate to the most recent ordered entry of program data into the LUX IC
3. OD0, OD1, OD2, ..., and OD15 relate to the first 16 bits of ordered fault and status data out of the LUX IC
NOTES:
OD0
CSB
device.
device.
1. RSTB is a logic [1] state during the above operation.
2. D15
: D0 relate to the most recent ordered entry of data into the device.
3. OD15
: OD0 relate to the first 16 bits of ordered fault and status data out of the device.
Notes
IN_ON[x]
IN[x]
t
IN