10XSC425 Datasheet, PDF (31/56 Pages) Freescale Semiconductor, Inc – Quad High Side Switch

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.
CCSSBB
CS
SCLK
SI
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SO
OD15 OD14 OD13 OD12 OD11 OD10 OD9 OD8 OD7 OD6 OD5 OD4 OD3 OD2 OD1 OD0
6.2
Notes 1. RSTB is a logic [1] state during the above operation.
NOTES: 1. ^2.R^DST¹B⁵i^:s^Din⁰a^rl^eog^laic^teH s^totat^te^hd^eur^ming^osth^te^ra^eb^co^eve^ntop^oe^rr^da^etio^rn^e.^{d entry of data into the device.}
2. 3.DO,DD115, D:O2,D...0, arnedlaDt1e5troelathteetofitrhsetm1o6stbreitcsenotfoordredredreedntrfyaoufltpraongrdamstdaattuasintdoathtae LodUeuXvtiIcoCef .the device.
3. OD0, OD1, OD2, ..., and OD15 relate to the first 16 bits of ordered fault and status data out of the LdUeXvicICe.
Figure 10. Single 16-Bit Word SPI Communication
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.
t_IN
IN[x]
IN_ON[x]
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).
Analog Integrated Circuit Device Data
Freescale Semiconductor
10XSC425
31