參數(shù)資料
型號(hào)： L99PD08
廠商： STMICROELECTRONICS
元件分類： 電源管理
英文描述： POWER SUPPLY MANAGEMENT CKT, PQFP32
封裝： ROHS COMPLIANT, LQFP-32
文件頁(yè)數(shù)： 41/41頁(yè)
文件大?。?/td> 750K
代理商： L99PD08
L99PD08
Pin definitions and functions
Doc ID 15872 Rev 3
9/41
The output PWM period is a factor of 256 of the frequency applied on CLK_INx signal.
If the external clock signal is not available or is below fPWM(min) , the device will fallback to an
internal PWM frequency generator fPWM of approximately 122Hz periode.
2.3
LHOMEN
This pin allows connecting the output pull-down resistor for LIMP HOME mode. This pin is
pulled to VDDIO in normal mode and is pulled low in case of failure (RESET and FAIL SAVE
mode).
If power supply VDDIO is not connected, LHOMEN becomes weak low (LIMP HOME
mode).
2.4
Output 0 to 7 (OUT0 … OUT7)
True open drain outputs are used to drive the High Side Driver inputs. These lines must
have a pull-up resistor connected either to a separate supply or LHOMEN signal if LIMP
HOME is supported.
These outputs are high impedance during RESET, Fail Safe modes and during SW Reset.
2.5
Status/current sense inputs (ST0/CS0 … ST7/CS7)
Those inputs are used to take the status or current sense information from DIGITAL or
ANALOG HSD and provide information to the internal diagnosis. Every output has to
correspond to the same HSD channel like the ST/CS input (OUT0 with ST0/CS0, OUT1 with
ST1/CS1, …). Status of digital channels have to have an external pull-up resistor
(4.7 kOhm) and a series protection resistor of 4.7 kOhm to STx/CSx, current sense signals
of analog channels have to be connected to STx/CSx pins through a 100 Ohm reverse
battery protection resistor.
The HSD type which is connected to the device (digital or analog) must be selected through
the register DEV_TYPE (Addr: hex02).
2.6
Multiplexed status/current sense output (MUX_ST/CS)
The MUX_ST/CS Pin reflects the status or current sense information corresponding to the
channel selected in the control register bits MUX_EN, MUX_A, B, C (Addr: hex00; Bit 7-4).
This pin delivers up to 3 mA at 2.7 V. It is recommended to use a 1.6k to 2.7kOhm external
resistor to ground for the maximum dynamic range. The best choice for the external resistor
depends on the Rdson class of the analog current sense HSD and of the loads.
If the multiplexer is disabled the MUX_ST/CS pin is in tristate condition.
2.7
VDDIO, VCORE3
The digital voltage supply of the device is internally limited to 3.3 V. In order to support also
the 5 V supply voltages a linear internal voltage regulator can be used.
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