LTC1960CG Datasheet, PDF (14/28 Pages) Linear Technology – Dual Battery Charger/ Selector with SPI Interface

LTC1960
OPERATION
2-Byte SPI Read Format:
bit 7........byte 1.......bit 0
bit 7........byte 2............bit 0
MOSI
0 0 0 0 A0 A1 A2 0
0 0 0 0 A0 A1 A2 1
MISO
X 0 0 0 0 A0 A1 A2
X FA LP DC PF CH X X
Status Address:
A[2:0] = b010
Status Read Data:
LP = LOW_POWER (Low power comparator output)
DC = DCDIV (DCDIV comparator output)
PF = POWER_FAIL (Set if selected power supply failed to hold up system power after
three tries)
CH = CHARGING (One or more batteries are being charged)
FA = FAULT. This bit is set for any of the following conditions:
1) The LTC1960 is still in power-on reset.
2) The LTC1960 has detected a short circuit and has shut down power and charging.
3) The system has asserted a fast off using DCDIV.
Note: All other values of A[2:0] are reserved and must not be used.
A status read is illustrated in Figure 2.
SSB
SCK
MOSI
MISO
BYTE 1
BYTE 2
1960 F02
Figure 2. SPI Read of FA = 0, LP = 0, DC = 1, PF = 0, and CH = 1
1960fb
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